By G. Lemaire, F. Gastal (auth.), Dr. Gilles Lemaire (eds.)
This e-book presents a hyperlink among theoretical and utilized features of plant food and agriculture. It introduces new thoughts in plant nutrients and indicates how they are often utilized in perform with a purpose to examine the nitrogen prestige in vegetation and to enhance nitrogen meals via optimized N fertilization administration. therefore, financial advantages should be received from agriculture, whereas whilst damaging results at the atmosphere could be avoided. The the most agricultural plants corresponding to grasses, wheat, barley, Durum wheat, maize, sorghum, grain legumes and potatoes are lined. The booklet comes in handy resource for either agronomists and practitioners.
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Additional resources for Diagnosis of the Nitrogen Status in Crops
The second mistake is to use an average value of NNI instead of the integrated value of IN < 1. This would lead to an underestimation of the effect of a period of N deficiency when it followed a period of luxury consumption, as is frequently the case for crops receiving an N application at the beginning of the growth period. By definition, crops having a greater plant N% than the minimum required for the maximum growth rate do not have any advantage in terms of growth capacity. The only advantage for a crop of having luxury consumption ofN is to delay the onset of N deficiency when soil N shortage occurs during later growth.
3 0 0 0 .... .... 2 0 20 40 60 80 100 120 140 160 Plant weight (g) Fig. 9. Decline in NO/O with increasing plant mass for lamina and pseudo stem fraction of isolated plants of sweet sorghum odes, which leads to a rapid decrease in stem N% with increasing stem mass. Thus, the metabolic plant part could correspond to chloroplastic tissues plus expanding meristematic tissues with a high N concentration, while the structural component could correspond to mature supporting tissues with a low N concentration.
10 shows that for a mean mass per plant greater than around 109, the slope of the relationship between In(plantN%) and In (plant mass) for an individual plant declines more rapidly in a dense canopy than in an isolated plant. 34, which corresponds to the general value found for coefficient b in Eq. 106. It is clear that competition for light between individual plants inside a dense crop causes a large reduction in plant N%. In the data presented in Fig. 10, competition for soil N cannot be put forward as a cause of plant N% decline, because plant N% corresponded to the critical plant N concentration, and additional N supply did not result in extra growth.