G aziantep Tarim il Mudurlugu ile isbirligi halinde yurutulen bu calismada CBS ve uzaktan algila... more G aziantep Tarim il Mudurlugu ile isbirligi halinde yurutulen bu calismada CBS ve uzaktan algilama teknikleri kullanilarak Gaziantep ilindeki tarim alanlarinin ozellikle ilde ekonomik onemi fazla olan antepfistigi ve zeytin alanlarinin miktari ve dagilimi belirlenmistir. Bu amacla Gaziantep ilini kaplayan farkli iki doneme ait uydu goruntuleri yer dogrulama verileri ile birlikte degerlendirilerek oncelikle ildeki tarim alani, orman-mera, ve tarim disi alan olmak uzere uc ana grupta toplanmistir. Daha sonra tarim alanlari icerisinde yogunlasilarak bu alandaki iki alt sinif tarla alanlari ve meyvelikler olarak tespit edilmistir. Goruntu siniflama sonucu elde edilen istatistikler il ve ilce bazinda verilmistir.
Rangelands are basically one of the main feed resources for livestock. They are also important fo... more Rangelands are basically one of the main feed resources for livestock. They are also important for watershed functions, biodiversity, and recreation. It is necessary to be known rangelands current status for their improvement and management. For this reason vegetation survey was conducted on the rangelands of Kayseri Province in year 2009. A modified wheel point method with loop was used for vegetation survey in the 60 representative survey sites of rangelands in Kayseri province. The results of this survey indicated that vegetation cover was detected as 57.85 %. The cover rates of decreasers and increasers in botanical composition were 12.62 % and 19.98 %, respectively. The numbers of sites determined as good, fair, and poor conditions were 1, 29, and 30, respectively. The 59 sites of total sites were identified as fair and poor in condition based on the rangeland condition classes. On the other hand, 26 sites were found as risky and 28 sites as unhealthy in health categories. Thes...
International Journal of Environment and Geoinformatics
Product simulation programs with DSSAT are based on the principle of predicting the potentials of... more Product simulation programs with DSSAT are based on the principle of predicting the potentials of yield and other phenological parameters of wheat varieties with different fertilizer application doses in different climatic and soil conditions. For this purpose, different wheat varieties (Bayraktar, Tosunbey) were used in order to test the use of the DSSAT simulation model in semi-arid conditions in the Ikizce experimental area of the Haymana District of Ankara Province, Field Crops Central Research Institute, during the 2017-2018 and 2018-2019 periods. The aim of this study is to predict yield in wheat varieties (Bayraktar, Tosunbey) using CERES and CROPGRO sub-models of DSSAT v.4.7.5 simulation model. In the study, the model was run at different nitrogen application doses (0, 6, 12, 18 kg/da) to reveal the yield prediction potential of the wheat cultivars in semi-arid conditions. For the calibration of the model, the grain yield, plant height and Leaf area index (LAI) data obtained...
Artvin Çoruh Üniversitesi Orman Fakültesi dergisi, 2015
The aim of this study was to determine plant nutrients content and to in terms of soil variables ... more The aim of this study was to determine plant nutrients content and to in terms of soil variables their soil database and generate maps of their distribution on agricultural land in Central and Eastern Black Sea Region using geographical information system (GIS). In this research, total 3400 soil samples (0-20 cm depth) were taken at 2.5 x 2.5 km grid points representing agricultural soils. Total nitrogen, extractable calcium, magnesium, sodium, boron, iron, copper, zinc and manganese contents were analysed in collected soil samples. Analysis results of these samples were classified and evaluated for deficiency, sufficiency or excess with respect to plant nutrients. Afterwards, in terms of GIS, a soil database and maps for current status of the study area were created by using inverse distance weighted (IDW) interpolation method. According to this research results, it was determined sufficient plant nutrient elements in terms of total nitrogen, extractable iron, copper and manganese in arable soils of Central and Eastern Blacksea Region while, extractable calcium, magnesium, sodium were found good and moderate level in 66.88%, 81.44% and 64.56% of total soil samples, respectively. In addition, insufficient boron and zinc concentration were found in 34.35% and 51.36% of soil samples, respectively
Turkish Journal of Agricultural Engineering Research, 2020
Early crop yield estimates could provide up-to-date information on supply, demand, stocks, and ex... more Early crop yield estimates could provide up-to-date information on supply, demand, stocks, and export availability through which governing bodies can make better agricultural management plans. This study aims to develop a yield model estimating pre-harvest winter wheat yield at both tillering and flowering stages using a multiple linear regression approach based on the relationship between actual yield and satellite derived crops’ phenological parameters. Four crop parameters (NDVI, Cumulative NDVI, LAI and FPAR) were regressed in combination to find the best applicable model. Regression results showed that correlations for all models among the variables of the flowering period are higher than that of tillering (0.63>0.53). The mean RMSE’s of the observed vs predicted yields for tillering period was 645.9 kg ha-1 and 574.5 kg ha-1 for flowering period. The optimal developed model which consists of NDVI and CNDVI variables provided 76% and 79% of predicting accuracy 3 and 1.5 mont...
This study was conducted to determine some vegetative characters of pastures in Amasya province. ... more This study was conducted to determine some vegetative characters of pastures in Amasya province. In the study, 106 spots were chosen and plant species were tried to be identified in each spot. Totally 186 plant species were categorized in 3 groups: i) 40 species were in family of grasses, ii) 42 species were in leguminosae, and iii) 104 species were in the group of other families. This plant species were also divided into 3 different successional groups: i) 34 species were decreases, ii) 19 species were increasers, and 133 species were invaders. In the experiment field, plant coverage rate was%77,8, average rate of legumes, grasses and other families in plant species were found as 22.84%,41.81 and 35.35%, respectively. Considering the different successional groups, which had influential effect to pasture quality, decreasers, increasers, and invaders had 18.07%, 28.41% and 53.52%, respectively.
Uydu goruntulerinden hesaplanan bitki ortusu indeksi (NDVI) yeryuzundeki yesil bitki ortusunun iz... more Uydu goruntulerinden hesaplanan bitki ortusu indeksi (NDVI) yeryuzundeki yesil bitki ortusunun izlenmesinde yaygin olarak kullanilmaktadir. Bu calismada Turkiye genelinde bitki ortusu yogunlugunun dagilimi, bitkilerin buyumeye baslama tarihi ve en yuksek yogunluga erisme tarihi gibi zamansal degisiminin incelenmesi amaclanmistir. Calismada Turkiye’yi kapsayan SPOT - Veg NDVI arsiv verileri kullanilmistir. Bu veriler VAST yazilimi ile analiz edilmistir. Calisma sonucuna gore vejetasyon aktivitesinin en erken Akdeniz, Ege ve Guneydogu’da basladigi belirlenmistir. Dogu Anadolu bolgesinde vejetasyon aktivitesinin baslamasi yukseklige bagli olarak yilin 150. gunu yani Mayis ayi sonunda olmaktadir. Izlenen diger vejetasyon parametreleri de bolgelere bagli olarak benzer ozellikler gostermistir. Calisma sonucunda NDVI verileri ile bitki ortusu degisiminin basarili bir sekilde izlenip analiz edilebilecegi gorulmustur.
2015 Fourth International Conference on Agro-Geoinformatics (Agro-geoinformatics), 2015
The study was carried out on natural rangeland areas of Central Anatolia Region of Turkey. The ob... more The study was carried out on natural rangeland areas of Central Anatolia Region of Turkey. The objective of this study is to monitor seasonal changes on rangeland vegetation by remote sensing data. Spectral reflectance of plants changes over time based on their phenological period. Differences in topography and climatical factors affect plant phenology. Vegetative growth period from green-up to senescence can be monitored by various vegetation indices. Normalized Difference Vegetation Index (NDVI) is one of the most widely-used indices that indicates the amaount of photosynthetically active green vegetation on the land. In this study, Spot-vegetation data have been used to show seasonal changes of rangeland vegetation in Central Anatolian rangelands. Satellite images cover time series of 1998-2009 years. Every year consist of 36 NDVI images, each representing 10 days composite NDVI data. Sampling points were selected representing certain ecological regions. NDVI values were extracted from those points of composit NDVI images. According to results of the study carried out in the Central Anatolian rangelands, NDVI patterns are similar and vegetation starts green-up at the beginnig of March and NDVI reaches peak values on mid of May. NDVI reaches peak value mid of June in rangeland of Sivas province.
Erken ve aşırı otlatma gibi yanlış kullanım meralarımızın bozulmalarına sebep olmakta ve bu durum... more Erken ve aşırı otlatma gibi yanlış kullanım meralarımızın bozulmalarına sebep olmakta ve bu durumun tabii sonucu olarak hem kalite ve hem de verim değerleri düşmektedir. Mevcut durumun tespit edilmesi ve gerekli tedbirlerin alınması gereklidir. Bu nedenle Çankırı ili mera alanlarında 2008 yılında vejetasyon etüt çalışmaları yapılmıştır. Bu çalışmalar esnasında koordinat, rakım, yöney, eğim, toprak derinliği, taşlılık, otlatma yoğunluğu ve erozyon şiddeti gibi özellikler kaydedilmiştir. Her bir durakta toprak örnekleri alınarak fiziksel ve kimyasal analizleri yapılmıştır. İlin tüm meralarını temsil edecek 41 durak belirlenmiş ve tekerlek nokta yöntemiyle vejetasyon etüdü yapılmıştır. Araştırma sonucunda bitki ile kaplı alan % 65.19 bulunmuş olup çıplak alan % 34.81 olmuştur. Azalıcı ve çoğalıcı bitki türleri oranları sırayla % 14.72 ve % 24.80 olarak saptanmıştır. İncelenen mera alanlarından çok iyi, iyi, orta ve zayıf durumda olanlar sırayla 1, 3, 23 ve 14 adet olarak tespit edilmiş...
Areas that have similar elevation and climatic characters called as ecologically homogenous areas... more Areas that have similar elevation and climatic characters called as ecologically homogenous areas. It is assumed that differences in vegetation and crop productivity in these homogenous areas are due to changes in soil types and different management applications. Total evapotranspiration was calculated for 265 meteorological stations over Turkey from meteorological parameters such as temperature, relative h umidity, sunshine duration and wind speed using Penman-Monteith method. Point values of total evapotranspiration and total precipitation were interpolated using ANUSPLINE method. Drought index was calculated from these two parameters and classified into six classes. Elevation data was produced using SRTM digital elevation model and classified into seven classes. A total of 37 Homogenous area were obtained in Turkey by combining drought index layer with elevation layer.
G aziantep Tarim il Mudurlugu ile isbirligi halinde yurutulen bu calismada CBS ve uzaktan algila... more G aziantep Tarim il Mudurlugu ile isbirligi halinde yurutulen bu calismada CBS ve uzaktan algilama teknikleri kullanilarak Gaziantep ilindeki tarim alanlarinin ozellikle ilde ekonomik onemi fazla olan antepfistigi ve zeytin alanlarinin miktari ve dagilimi belirlenmistir. Bu amacla Gaziantep ilini kaplayan farkli iki doneme ait uydu goruntuleri yer dogrulama verileri ile birlikte degerlendirilerek oncelikle ildeki tarim alani, orman-mera, ve tarim disi alan olmak uzere uc ana grupta toplanmistir. Daha sonra tarim alanlari icerisinde yogunlasilarak bu alandaki iki alt sinif tarla alanlari ve meyvelikler olarak tespit edilmistir. Goruntu siniflama sonucu elde edilen istatistikler il ve ilce bazinda verilmistir.
Rangelands are basically one of the main feed resources for livestock. They are also important fo... more Rangelands are basically one of the main feed resources for livestock. They are also important for watershed functions, biodiversity, and recreation. It is necessary to be known rangelands current status for their improvement and management. For this reason vegetation survey was conducted on the rangelands of Kayseri Province in year 2009. A modified wheel point method with loop was used for vegetation survey in the 60 representative survey sites of rangelands in Kayseri province. The results of this survey indicated that vegetation cover was detected as 57.85 %. The cover rates of decreasers and increasers in botanical composition were 12.62 % and 19.98 %, respectively. The numbers of sites determined as good, fair, and poor conditions were 1, 29, and 30, respectively. The 59 sites of total sites were identified as fair and poor in condition based on the rangeland condition classes. On the other hand, 26 sites were found as risky and 28 sites as unhealthy in health categories. Thes...
International Journal of Environment and Geoinformatics
Product simulation programs with DSSAT are based on the principle of predicting the potentials of... more Product simulation programs with DSSAT are based on the principle of predicting the potentials of yield and other phenological parameters of wheat varieties with different fertilizer application doses in different climatic and soil conditions. For this purpose, different wheat varieties (Bayraktar, Tosunbey) were used in order to test the use of the DSSAT simulation model in semi-arid conditions in the Ikizce experimental area of the Haymana District of Ankara Province, Field Crops Central Research Institute, during the 2017-2018 and 2018-2019 periods. The aim of this study is to predict yield in wheat varieties (Bayraktar, Tosunbey) using CERES and CROPGRO sub-models of DSSAT v.4.7.5 simulation model. In the study, the model was run at different nitrogen application doses (0, 6, 12, 18 kg/da) to reveal the yield prediction potential of the wheat cultivars in semi-arid conditions. For the calibration of the model, the grain yield, plant height and Leaf area index (LAI) data obtained...
Artvin Çoruh Üniversitesi Orman Fakültesi dergisi, 2015
The aim of this study was to determine plant nutrients content and to in terms of soil variables ... more The aim of this study was to determine plant nutrients content and to in terms of soil variables their soil database and generate maps of their distribution on agricultural land in Central and Eastern Black Sea Region using geographical information system (GIS). In this research, total 3400 soil samples (0-20 cm depth) were taken at 2.5 x 2.5 km grid points representing agricultural soils. Total nitrogen, extractable calcium, magnesium, sodium, boron, iron, copper, zinc and manganese contents were analysed in collected soil samples. Analysis results of these samples were classified and evaluated for deficiency, sufficiency or excess with respect to plant nutrients. Afterwards, in terms of GIS, a soil database and maps for current status of the study area were created by using inverse distance weighted (IDW) interpolation method. According to this research results, it was determined sufficient plant nutrient elements in terms of total nitrogen, extractable iron, copper and manganese in arable soils of Central and Eastern Blacksea Region while, extractable calcium, magnesium, sodium were found good and moderate level in 66.88%, 81.44% and 64.56% of total soil samples, respectively. In addition, insufficient boron and zinc concentration were found in 34.35% and 51.36% of soil samples, respectively
Turkish Journal of Agricultural Engineering Research, 2020
Early crop yield estimates could provide up-to-date information on supply, demand, stocks, and ex... more Early crop yield estimates could provide up-to-date information on supply, demand, stocks, and export availability through which governing bodies can make better agricultural management plans. This study aims to develop a yield model estimating pre-harvest winter wheat yield at both tillering and flowering stages using a multiple linear regression approach based on the relationship between actual yield and satellite derived crops’ phenological parameters. Four crop parameters (NDVI, Cumulative NDVI, LAI and FPAR) were regressed in combination to find the best applicable model. Regression results showed that correlations for all models among the variables of the flowering period are higher than that of tillering (0.63>0.53). The mean RMSE’s of the observed vs predicted yields for tillering period was 645.9 kg ha-1 and 574.5 kg ha-1 for flowering period. The optimal developed model which consists of NDVI and CNDVI variables provided 76% and 79% of predicting accuracy 3 and 1.5 mont...
This study was conducted to determine some vegetative characters of pastures in Amasya province. ... more This study was conducted to determine some vegetative characters of pastures in Amasya province. In the study, 106 spots were chosen and plant species were tried to be identified in each spot. Totally 186 plant species were categorized in 3 groups: i) 40 species were in family of grasses, ii) 42 species were in leguminosae, and iii) 104 species were in the group of other families. This plant species were also divided into 3 different successional groups: i) 34 species were decreases, ii) 19 species were increasers, and 133 species were invaders. In the experiment field, plant coverage rate was%77,8, average rate of legumes, grasses and other families in plant species were found as 22.84%,41.81 and 35.35%, respectively. Considering the different successional groups, which had influential effect to pasture quality, decreasers, increasers, and invaders had 18.07%, 28.41% and 53.52%, respectively.
Uydu goruntulerinden hesaplanan bitki ortusu indeksi (NDVI) yeryuzundeki yesil bitki ortusunun iz... more Uydu goruntulerinden hesaplanan bitki ortusu indeksi (NDVI) yeryuzundeki yesil bitki ortusunun izlenmesinde yaygin olarak kullanilmaktadir. Bu calismada Turkiye genelinde bitki ortusu yogunlugunun dagilimi, bitkilerin buyumeye baslama tarihi ve en yuksek yogunluga erisme tarihi gibi zamansal degisiminin incelenmesi amaclanmistir. Calismada Turkiye’yi kapsayan SPOT - Veg NDVI arsiv verileri kullanilmistir. Bu veriler VAST yazilimi ile analiz edilmistir. Calisma sonucuna gore vejetasyon aktivitesinin en erken Akdeniz, Ege ve Guneydogu’da basladigi belirlenmistir. Dogu Anadolu bolgesinde vejetasyon aktivitesinin baslamasi yukseklige bagli olarak yilin 150. gunu yani Mayis ayi sonunda olmaktadir. Izlenen diger vejetasyon parametreleri de bolgelere bagli olarak benzer ozellikler gostermistir. Calisma sonucunda NDVI verileri ile bitki ortusu degisiminin basarili bir sekilde izlenip analiz edilebilecegi gorulmustur.
2015 Fourth International Conference on Agro-Geoinformatics (Agro-geoinformatics), 2015
The study was carried out on natural rangeland areas of Central Anatolia Region of Turkey. The ob... more The study was carried out on natural rangeland areas of Central Anatolia Region of Turkey. The objective of this study is to monitor seasonal changes on rangeland vegetation by remote sensing data. Spectral reflectance of plants changes over time based on their phenological period. Differences in topography and climatical factors affect plant phenology. Vegetative growth period from green-up to senescence can be monitored by various vegetation indices. Normalized Difference Vegetation Index (NDVI) is one of the most widely-used indices that indicates the amaount of photosynthetically active green vegetation on the land. In this study, Spot-vegetation data have been used to show seasonal changes of rangeland vegetation in Central Anatolian rangelands. Satellite images cover time series of 1998-2009 years. Every year consist of 36 NDVI images, each representing 10 days composite NDVI data. Sampling points were selected representing certain ecological regions. NDVI values were extracted from those points of composit NDVI images. According to results of the study carried out in the Central Anatolian rangelands, NDVI patterns are similar and vegetation starts green-up at the beginnig of March and NDVI reaches peak values on mid of May. NDVI reaches peak value mid of June in rangeland of Sivas province.
Erken ve aşırı otlatma gibi yanlış kullanım meralarımızın bozulmalarına sebep olmakta ve bu durum... more Erken ve aşırı otlatma gibi yanlış kullanım meralarımızın bozulmalarına sebep olmakta ve bu durumun tabii sonucu olarak hem kalite ve hem de verim değerleri düşmektedir. Mevcut durumun tespit edilmesi ve gerekli tedbirlerin alınması gereklidir. Bu nedenle Çankırı ili mera alanlarında 2008 yılında vejetasyon etüt çalışmaları yapılmıştır. Bu çalışmalar esnasında koordinat, rakım, yöney, eğim, toprak derinliği, taşlılık, otlatma yoğunluğu ve erozyon şiddeti gibi özellikler kaydedilmiştir. Her bir durakta toprak örnekleri alınarak fiziksel ve kimyasal analizleri yapılmıştır. İlin tüm meralarını temsil edecek 41 durak belirlenmiş ve tekerlek nokta yöntemiyle vejetasyon etüdü yapılmıştır. Araştırma sonucunda bitki ile kaplı alan % 65.19 bulunmuş olup çıplak alan % 34.81 olmuştur. Azalıcı ve çoğalıcı bitki türleri oranları sırayla % 14.72 ve % 24.80 olarak saptanmıştır. İncelenen mera alanlarından çok iyi, iyi, orta ve zayıf durumda olanlar sırayla 1, 3, 23 ve 14 adet olarak tespit edilmiş...
Areas that have similar elevation and climatic characters called as ecologically homogenous areas... more Areas that have similar elevation and climatic characters called as ecologically homogenous areas. It is assumed that differences in vegetation and crop productivity in these homogenous areas are due to changes in soil types and different management applications. Total evapotranspiration was calculated for 265 meteorological stations over Turkey from meteorological parameters such as temperature, relative h umidity, sunshine duration and wind speed using Penman-Monteith method. Point values of total evapotranspiration and total precipitation were interpolated using ANUSPLINE method. Drought index was calculated from these two parameters and classified into six classes. Elevation data was produced using SRTM digital elevation model and classified into seven classes. A total of 37 Homogenous area were obtained in Turkey by combining drought index layer with elevation layer.
Although farming techniques have developed in late years, climate will be unquestionably one of t... more Although farming techniques have developed in late years, climate will be unquestionably one of the main factors affecting agricultural production significantly. There have been excessive fluctuations in agricultural production due to temporal and spatial changes of meteorological factors. Normalized Difference Vegetation Index (NDVI) data obtained from the satellite images is one of the most important data revealing the effect of climatical condition on vegetation. Vegetation development is often associated with precipitation. The higher the amount of precipitation, the more green vegetation at that area, which, in return, leads to increase the value of NDVI. Increasing live vegetation and NDVI values indicate the higher crop yield. In contrast, low vegetative abundance and productivity result in decreasing NDVI values. Reference data are needed to observe the changes of NDVI values. These values are typically minimum, maximum and average values of archived NDVI data obtained in the same period of the same area. So these numerical data have been quite applicable for organizations who want to monitor the current status of agricultural areas by comparing the long term average and current NDVI. In this study NDVI data obtained from Terra Modis satellite, were used for monitoring and interpreting the vegetation condition in Turkey.
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