寒地水稻不同施氮水平对水稻产量、品质的影响

采用单因素重复试验,研究不同施氮水平对龙稻5号和东农428产量及品质的影响。结果表明:不同施氮水平对龙稻5号和东农428的平方米穗数、穗粒数、空瘪粒、千粒重及产量影响差异显著,龙稻5号的平方米穗数随施氮量的增加而增加,穗粒数、千粒重、产量在施氮水平0~135kg/hm2范围内随施氮量的增加而增加,但施氮量达到175kg/hm2时,穗粒数下降,空瘪粒高;东农428也具有相同的变化趋势。蛋白质含量、直链淀粉含量随施氮量增加而增加;但东农428直链淀粉含量在施氮量为175kg/hm2时含量下降。龙稻5号和东农428的糙米率、精米率和整精米率以135kg/hm2施肥水平最高。龙稻5号垩白度和垩白率处理间差异显著,东农428胶稠度处理间差异显著,随施氮水平的提高,胶稠度降低。

Study of Different Nitrogen Level on Rice Yield and Quality at Cold Area

The effect of different nitrogen levels on rice yield and quality of Longdao5 and Dongnong428 was studied through single factors experimental design.The results showed that the differences were significant by different nitrogen levels effect on rice panicle per square meters,grains per spike,air shriveled grain,1000-grain weight and yield.The panicle per square meters of Longdao5 was increased with the increases of nitrogen.During the nitrogen level 0~135 kg/hm 2 ,the number of grains per spike,1000-grain weight and yield was increased with the amount of nitrogen increases,while nitrogen level in 175 kg/hm 2 the number of grains per spike was declined and air shriveled grain was high,Dongnong 428 had the same trend.Protein content and amylose content of rice was increased with the amount of nitrogen increases.The amylose content of Dongnong 428 was decreased for 175 kg/hm 2.The brown rice rate,milled rice rate and head milled rice rate of Longdao5 and Dongnong428 were the biggest in nitrogen level 135 kg/hm 2.The chalkiness degree and chalkiness rate of Longdao5 was significant between each treatment,the gel consistency difference of Dongnong428 was significant,and the gel consistency was decreased with the nitrogen level increased.