Reutilized nitrogen's impact on the wheat's growth processes
2000
Filipov, Kh. (Institut po Introduktsiya i Rastitelni Resursi, Sadovo (Bulgaria))
On sand samples was applied fertilizing with gradually increasing nitrogen norms of 50, 200, 400 and 600 mg/kg sand. A fraction of the plants was analyzed for total nitrogen's content during the stages of tillering, elongation and earing; other fraction was shifted to a water sample with and without nitrogen and were grown in these conditions up to the end of the vegetation. The plants in which the initial nitrogen level had been the lowest and which had been grown for the longest period in nitrogenless media concentrate up to 100 units of dry matter per reutilized nitrogen unit. This fact and the observed wheat's feature to achieve equal values of minimum nitrogen contents in its tissues, at different initial concentrations of the element when the nitrogen nutrition had been ceased allows for forecasting the possible dry matter concentration at an expected nitrogen deficit. During the favorable for the plants nitrogen nutrition periods, optimum nitrogen concentrations in the plants (below the toxic level) might be created, and they would provide nitrogen nutrients within the periods when the nitrogen source (the soil) would not meet the nitrogen requirements of the consumer (the wheat's sowing).
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