Effect of Various Sources of Nitrogen on Rice Paddy Yield¹

Abstract

Synopsis Ammonium nitrogen gave much better rice yields than nitrate nitrogen. Calcium cyanamide and urea were also more effective than nitrate nitrogen. Nitrate nitrogen applied just before heading proved more beneficial to rice than that applied at the early stage of plant growth. Generally, ammonium sulphate increased rice yields more than the other nitrogen fertilizers tested.

Paddy rice yield and greenhouse gas emissions: Any trade-off due to co-application of biochar and nitrogen fertilizer? A systematic review

“…However, their effects differ depending on the environment. Compared to NO 3 − fertilizers, NH 4 + based fertilizer gives better yield under anaerobic conditions [ 138 ]. Hydrolysis of NH 4 + [e.g.…”

Nitrogen nutrition of rice plants measured by growth and nutrient content in pot experiments. 1. Ionic balance and selective uptake.

“…There are many instances where more successful results have been obtained by the use of ammonium in place of nitrate as the source of nitrogen for rice plants. See, for instance, Wahhab and Bhatti (1957). In the experiments of Kelly (1911), Willis and Carrers (1923), Metzger and Janssen (1928) rice grew well when nitrogen was added as ammonium, but the plants suffered from chlorosis when grown with nitrate as the sole sorce of nitrogen.…”

On the mineral nutrition of lowland rice. (Oryza sativa) II.

“…It has been shown several times that NH4-N-fertilizers are a better Nsource for lowland rice than NO;I-N-fertilizers (a.o. PATRICK andSTURGIS, 1954, 1955 ;MITSUI, 1955 ;WAHHAB and BHATTI, 1957 ;Go BAN HONG, 1958). This can be predicted from a scheme, represented by MITSUI (1955) and completed by the present authors.…”