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近几年来,在水稻丰产栽培的实践中,由于增施肥料,水稻倒伏和结实不良的现象显著增加,因此,合理施肥的问题,特别是控制和协调水稻氮素营养的问题,成为水稻高产的重要关键。为了夺取高产必须提高水稻营养水平,特别是氮素营养水平。然而,按照产量计划施肥量并不过多的情况下,常常产生氮素过量的不良后果。根据以往的研究和生产实践证明,这除了与施肥的数量、时期、和比例有关外,还与氮肥的种类和形态有密切关系。前人的研究证明,不同形态氮肥在植物体内所发生的氧化还原反应是不相同的,特别是硝酸盐中氧化态氮(NO_3~-)和铵盐中还原态氮(NH_4~+),对于植物体内代谢过程的强度和趋向,具有完全不同的影响。可惜有关水稻不同发育时期体内物质代谢生物氧化还原变化规律,氮肥形态在水稻体内的生物化学反应,目前仍然缺乏深入研究和明确了解。对于水稻是否适宜施肥硝酸肥料,看法也有不同。作者从
In recent years, in the practice of high-yielding rice cultivation, the phenomenon of fertilization, especially the problem of controlling and coordinating the nitrogen nutrition of rice has become a high-yielding rice due to the increase of fertilizers and the significant increase of rice lodging and poor stubbornness. Important key. In order to seize high yields, it is necessary to raise the level of rice nutrition, especially the level of nitrogen nutrition. However, if the amount of fertilizer is not excessive according to the yield plan, undesirable consequences of excessive nitrogen levels often occur. According to previous research and production practice, it has been proved that it is closely related to the type and morphology of nitrogenous fertilizers, besides quantity, period and proportion of fertilization. Previous studies have shown that different forms of nitrogen fertilizer redox reactions occur in plants are not the same, especially the nitrate nitrogen (NO_3 ~) and ammonium nitrogen (NH_4 ~ +), for Plant metabolism and intensity of the body tend to have completely different effects. Unfortunately, there is still a lack of in-depth research and a clear understanding of the biochemical reactions of nitrogen forms in the rice body during the different developmental stages of rice. There is a difference in opinion whether rice is suitable for fertilizing nitrate fertilizer. Author from