Growth and chemical composition of corn (Zea mays L.) as influenced by NH4/NO3 ratio [ammonium nitrate]
1982
Hernando, V. | Pardo, M.T. | Lopez-Fando, C. (Consejo Superior de Investigaciones Cientificas, Madrid (Spain). Instituto de Edafologia y Biologia Vegetal)
The purpose of this research was to study the effect of NH4/NO3 ratio, on the growth, foliar surface and chemical composition of two different varieties of corn (ETA, FAO210 and PROTADOR, FAO 250). The experiment was carried out in a greenhouse. All nutrient solutions contained the same amount of N, but five NH4+/NO3 ratios (100/0; 75/25; 50/50; 25/75 and 0/100). The results had shown that both varieties, produced more shoot and root dry matter when grown in NO3 medium. Foliar surface followed the same trend as the dry matter, showing the detrimental effect of high NH4 levels. There were increases in the uptake of N, P and Zn with high NH4+ supply. The tops of plants grown in NH4+, contained higher Fe levels than those in NO3 cultured in NO3. Increasing NH4+ in the ratios decreased the K, and Ca percentages on tops and roots
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