PJB-2023-315
Effects of Exogenous Nitrogen Forms on Rice Growth and Nitrogen Accumulation
ZHAOHUI ZOU
Abstract
To optimize the concentration ratios of different nitrogen forms and improve the performance of foliar spraying, the effects of different exogenous Gly-N, NO-3,and NH+4-N concentration ratios on the physiological and biochemical indexes of the biomass, nitrogen content, root morphology and leaves of rice were investigated. The results showed that the effects of different exogenous nitrogen concentration compositions on the biomass, nitrogen content and physiological and biochemical indexes of rice were significantly different (P﹤0.05) when they were applied at the tillering stage of rice. In the treatment of Gly-N (2 500 μmol﹒L-1), NH+4-N (2 500 μmol﹒L-1) and low NO-3 (2 500 μmol﹒L-1), the rice biomass and nitrogen content reached the maximum of 68.6 mg﹒p-1 and 1 888.5 mg﹒g-1 respectively, with the variation trends of the total root length, root surface area, root volume and root activity of rice consistent with that of the biomass. In the treatment with high Gly-N and low inorganic nitrogen, the chlorophyll, soluble protein, content of soluble sugar and SOD activity were the highest, reaching 7.35 mg/g, 39.25 mg/g, 38.81 mg/g and 342.56 U·g-1, respectively. A certain increase of Gly-N concentration or reduction of inorganic nitrogen concentration can contribute to the growth of rice.
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