The aim of this study is to analyze the effects of early growth behaviors under conditions of P d... more The aim of this study is to analyze the effects of early growth behaviors under conditions of P deficiency on further performances at the end of the vegetative phase of different Zea mays L. genotypes. The effects of soil P availability on biomass and P allocation during early growth and its effects on further performances were investigated on six maize genotypes which were chosen for their growth and development traits in response to P availability. Plants were grown under two contrasting P supplies and collected at 393°Cd and 780°Cd after emergence. Shoot and root growth, root:shoot allometric indicators and efficiencies related to P uptake and utilization, carbon (C) assimilation and allocation were determined. The results showed that the behavior of the six–leave-stage plants was a determining indicator of plant performance at the pre-anthesis phase. Total dry weight of the different maize genotypes ranged from 8.3 to 19.2 g/plant under low P supply at 780°Cd. At 393°Cd, extreme...
... Lionel Jordan-Meille1,2 & Sylvain Pellerin1 1INRA, Unité mixte de recherche INRA-ENIT... more ... Lionel Jordan-Meille1,2 & Sylvain Pellerin1 1INRA, Unité mixte de recherche INRA-ENITA 'Transfert sol-plante et cycle des éléments minéraux dans les écosyst`emes cultivés', Domaine de la Grande ... Only the length (Lv) was measured on visible, not fully expanded leaves. ...
ABSTRACT Agricultural intensification over the last few decades has been accompanied by the exten... more ABSTRACT Agricultural intensification over the last few decades has been accompanied by the extensive use of anthropogenic phosphorus (P) derived from mined phosphate rock. Given the increasing scarcity of P resources, accurate estimates of the reliance of agriculture on anthropogenic P are required. Here, we propose a modeling approach for assessing the contribution of anthropogenic P to agricultural soil fertility and food production. We performed computations at country level and France was chosen as a typical Western European country with intensive agriculture. Four soil P pools were identified based on their bioavailability (labile vs. stable) and origin (anthropogenic vs. natural). Pool evolution between 1948 and 2009 was estimated by combining international databases and a simple biogeochemical model. An optimization procedure demonstrated the necessity of representing a stable P pool capable of replenishing the labile pool within 14 to 33 years in order to match country-scale observations. Mean simulated P pool sizes for 2009 (0–35 cm soil horizon) were 146, 616, 31 and 156 kgP/ha for natural stable, anthropogenic stable, natural labile and anthropogenic labile pools, respectively. We found that, on average 82% (min-max: 68–91%) of soil P (sum of labile and above defined stable) in that year was anthropogenic. The temporal evolution of this contribution is directly related to the integral of chemical fertilizer use over time, starting from 1948. The contribution of anthropogenic P to food production was similar at 84% (min-max: 72–91%), which is greater than budget-based estimates (~50–60%) commonly reported in the literature. By focusing on soil fertility and food production, this study provides a quantitative estimation of human perturbations of the P cycle in agroecosystems.
The relationship between soil K supply, characterised by the soil solution K concentration and th... more The relationship between soil K supply, characterised by the soil solution K concentration and the soil K buffer power, and plant K status was investigated for field grown crops. The study was carried out in 15 K fertilisation trials with maize and wheat covering a wide range of agricultural soils and K level. Soil K buffer power was obtained through
The aim of this study is to analyze the effects of early growth behaviors under conditions of P d... more The aim of this study is to analyze the effects of early growth behaviors under conditions of P deficiency on further performances at the end of the vegetative phase of different Zea mays L. genotypes. The effects of soil P availability on biomass and P allocation during early growth and its effects on further performances were investigated on six maize genotypes which were chosen for their growth and development traits in response to P availability. Plants were grown under two contrasting P supplies and collected at 393°Cd and 780°Cd after emergence. Shoot and root growth, root:shoot allometric indicators and efficiencies related to P uptake and utilization, carbon (C) assimilation and allocation were determined. The results showed that the behavior of the six–leave-stage plants was a determining indicator of plant performance at the pre-anthesis phase. Total dry weight of the different maize genotypes ranged from 8.3 to 19.2 g/plant under low P supply at 780°Cd. At 393°Cd, extreme...
... Lionel Jordan-Meille1,2 & Sylvain Pellerin1 1INRA, Unité mixte de recherche INRA-ENIT... more ... Lionel Jordan-Meille1,2 & Sylvain Pellerin1 1INRA, Unité mixte de recherche INRA-ENITA 'Transfert sol-plante et cycle des éléments minéraux dans les écosyst`emes cultivés', Domaine de la Grande ... Only the length (Lv) was measured on visible, not fully expanded leaves. ...
ABSTRACT Agricultural intensification over the last few decades has been accompanied by the exten... more ABSTRACT Agricultural intensification over the last few decades has been accompanied by the extensive use of anthropogenic phosphorus (P) derived from mined phosphate rock. Given the increasing scarcity of P resources, accurate estimates of the reliance of agriculture on anthropogenic P are required. Here, we propose a modeling approach for assessing the contribution of anthropogenic P to agricultural soil fertility and food production. We performed computations at country level and France was chosen as a typical Western European country with intensive agriculture. Four soil P pools were identified based on their bioavailability (labile vs. stable) and origin (anthropogenic vs. natural). Pool evolution between 1948 and 2009 was estimated by combining international databases and a simple biogeochemical model. An optimization procedure demonstrated the necessity of representing a stable P pool capable of replenishing the labile pool within 14 to 33 years in order to match country-scale observations. Mean simulated P pool sizes for 2009 (0–35 cm soil horizon) were 146, 616, 31 and 156 kgP/ha for natural stable, anthropogenic stable, natural labile and anthropogenic labile pools, respectively. We found that, on average 82% (min-max: 68–91%) of soil P (sum of labile and above defined stable) in that year was anthropogenic. The temporal evolution of this contribution is directly related to the integral of chemical fertilizer use over time, starting from 1948. The contribution of anthropogenic P to food production was similar at 84% (min-max: 72–91%), which is greater than budget-based estimates (~50–60%) commonly reported in the literature. By focusing on soil fertility and food production, this study provides a quantitative estimation of human perturbations of the P cycle in agroecosystems.
The relationship between soil K supply, characterised by the soil solution K concentration and th... more The relationship between soil K supply, characterised by the soil solution K concentration and the soil K buffer power, and plant K status was investigated for field grown crops. The study was carried out in 15 K fertilisation trials with maize and wheat covering a wide range of agricultural soils and K level. Soil K buffer power was obtained through
Uploads