摘要
为探明不同施氮水平对高丹草生产性能以及土壤无机氮残留的影响,试验以高丹草为材料,设置了N0(0 kg/hm2,对照)、N90(90 kg/hm2)、N180(180 kg/hm2)、N270(270 kg/hm2)、N360(360 kg/hm2)5个施氮量处理,采取随机区组设计。结果表明:①施氮肥可以显著提高苏丹草鲜草产量,其中施氮360 kg/hm2处理的产量达151 878kg/hm2。②随着施氮量的增加干物质生产效率、粗蛋白质生产效率均降低,其中施氮180 kg/hm2处理的高丹草氮肥利用率最高,施氮360 kg/hm2处理比施氮270 kg/hm2处理的氮肥利用率低10%;③土壤无机态氮主要集中在土壤表层(0-60 cm),随着施氮量的增加,土壤氮素残留增加,但主要表现在第1次刈割后,土壤氮素残留在第2次刈割后明显下降。
Sorghum hybrid was used to investigate the effect of different nitrogen levels on performance and nitrogen residues in soil.Based on the randomized block design,five nitrogen levels of N0(0 kg/hm2),N90(90 kg/hm2),N180(180 kg/hm2),N270(270 kg/hm2) and N360(360 kg/hm2) were designed.The results showed that ①nitrogen fertilizer could increase the fresh yield,and in N360 treatment the yield of 151 878 kg/hm2 was harvested;②With the increase of fertilizing nitrogen,the production efficiency of dry matter and crude protein was decreased.The highest nitrogen utilization efficiency of Sorghum hybrid was shown in N270 treatment,which was 39.34% higher than that in N360 treatment;③Soil nitrogen was mainly located in soil profile(0-60 cm).With the increase of fertilizing nitrogen,nitrogen residues were increased,especially in the first harvest.The nitrogen residues greatly decreased in the second harvest.
出处
《江苏农业学报》
CSCD
北大核心
2010年第6期1258-1263,共6页
Jiangsu Journal of Agricultural Sciences
基金
2007年公益性行业(农业)科研专项资助项目(nyhyzx07-022)
江苏省高校自然科学研究计划面上项目(09KJD230002)
关键词
高丹草
施氮水平
氮肥利用率
无机氮残留
Sorghum bicolor × Sorghum sudanese
nitrogen fertilization
nitrogen utilization efficiency
nitrogen residue