The attempt to explain the various reaktions of rape and corn plants on the nitrogen usee in the ammonium or nitrate forms

Abstract

The reaction of the rape and corn plants on the nitrogen applied in the form NO₃^- or NH₄⁺ was studied under the controlled conditions. The ammonium ions with rape markedly lowered the growth rate, the intensity of photosynthesis and biomass yield, with relation to the plants fertilized with nitrates. With corn the effect of both N-forms was similar and positive. The biomass of the rape using NH₄⁺, with relation to the plants fertilized with NO₃^- showed lower content of total N, and protein N, as well as markedly higher content of amino-acids of primary protein synthesis and their amides and free ammonium ions. Yet, the corn utilizing N-NH₄⁺ showed, as compared with the plants fertilized with NO₃^-, higher content of all studied organic N fractions. with similar content of free ammonium ions. This paper presents the thesis that the cause of the growth inhibition of rape fertilized with ammonium is low, as compared with corn, assimilation of NH₄⁺ ions drawn in the roots of this plant

Assessment of natural variability in leaf morphological and physiological traits in maize inbreds and their related hybrids during early vegetative growth

“…(3) Both B73 × Mo17 and Sids7 × Sids63 hybrids generally exhibited more vigorous growth traits than their parental inbreds, and (4) both hybrids showed relatively similar behavior in most of their initial growth parameters such as plant height, leaf number, and total leaf area. These results are in agreement with those of [56] who reported similar growth rates of a number of maize hybrids in the juvenile stage under similar N fertilization conditions. The general superiority of hybrids over their parental inbreds in overall growth is well documented [23,57,58].…”