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在常规栽培和优化栽培模式下,分别设置施氮量折合成纯氮0,105,142.5,180 kg/hm2的4个缓释氮肥用量处理,研究了缓释氮肥用量对超级杂交早稻株两优02产量和生理特性的影响。结果表明:在优化栽培模式下,各施氮量处理的产量均高于相应的常规栽培处理,其中纯氮用量142.5 kg/hm2的处理产量最高,而常规栽培各处理的产量则随施氮量的增加而提高;在优化栽培和常规栽培模式下,各时期叶片中的过氧化氢酶(CAT)活性、可溶性糖含量和根系活力均以施氮量180 kg/hm2的处理较高;施用纯氮142.5 kg/hm2的处理乳熟期—成熟期叶片中能保持较高的超氧化物歧化酶(SOD)活性和较低的丙二醛(MDA)含量,有利于延缓水稻功能叶片的衰老。
Under conventional and optimized cultivation modes, four slow-release nitrogen fertilizers were applied to treat 0, 105, 142.5 and 180 kg / hm2 of pure nitrogen respectively. The effects of slow-release nitrogen fertilizer on the yield and physiology Effect of characteristics. The results showed that under the optimized cultivation mode, the yield of each N application was higher than that of the corresponding conventional cultivation. The yield of pure nitrogen was highest at 142.5 kg / hm2, while that of conventional cultivation was increased with the rate of nitrogen application (CAT) activity, soluble sugar content and root activity of leaves at various periods were higher under 180 kg / hm2 nitrogen application rate. In the optimized cultivation and conventional cultivation modes, Nitrogen treatment at 142.5 kg / hm2 could maintain higher superoxide dismutase (SOD) activity and lower malondialdehyde (MDA) content in milk ripening - maturing leaves, which was beneficial to retard the senescence of rice functional leaves.