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研究不同氮用量对冷浸田水稻氮钾吸收利用和产量的影响,探求在冷浸田水稻氮肥适宜用量;以D优202水稻品种为材料,田间试验研究6个不同氮量(0、45、90、135、180、225 kg hm-2)下水稻含氮量、含钾量、氮和钾的积累量以及产量的差异及其相互关系。在冷浸田开沟降渍的条件下,在0~225 kg hm-2纯氮范围内,随氮肥水平的增加,水稻含氮量在有效分蘖临界叶龄期、拔节期、抽穗期均显著增加,成熟期先增后减,含钾量除有效分蘖临界叶龄期外其他时期均显著降低,含氮量相应提高含钾量会有所降低;植株氮和钾的积累量基本具有相同的趋势,先增加后减少。分析表明:水稻各个生育阶段的氮、钾与稻谷产量均呈正相关,增施氮肥有利于水稻氮和钾吸收利用的提高,但氮肥过高时氮和钾吸收利用不再增加,甚至有所降低。在磷钾一定的条件下,冷浸田水稻最高产量施氮量为169.0 kg hm-2,经济施氮量为153.9 kg hm-2。
The effects of different nitrogen application rates on nitrogen and potassium absorption and utilization and yield of cold-immersed rice were explored, and the appropriate nitrogen application rate in cold-paddy field was explored. Six rice cultivars, D0 and 202, were used to study the effects of nitrogen (0, 45, 90,135,180,225 kg hm-2), the accumulation of nitrogen, potassium, nitrogen and potassium and the yield and their correlation. Under the condition of ditching and sinking in cold paddy field, the nitrogen content of rice at critical leaf stage, jointing stage and heading stage of effective tillering increased with the increase of nitrogen level in the range of 0 ~ 225 kg hm-2 of pure nitrogen Increase and then increase at maturity, the content of potassium decreased significantly except for the critical leaf age at effective tillering stage, while the content of nitrogen increased correspondingly. The accumulation of nitrogen and potassium in plant basically had the same Trend, first increase and then decrease. The results showed that there was a positive correlation between nitrogen and potassium production and paddy yield in all growth stages of rice, while nitrogen application increased N and K absorption and utilization, but N and K uptake and utilization did not increase or even decreased . Under certain phosphorus and potassium conditions, the maximum yield of paddy field was 169.0 kg hm-2 and the economic nitrogen was 153.9 kg hm-2.