摘要
通过对云南省384组玉米试验结果分析,建立玉米土壤养分丰缺指标并测算玉米肥料利用率。结果表明,以极低、低、中、高、较高5级划分标准,玉米氮地力养分丰缺指标为<50、50～90、90～150、150～250、>250 mg/kg;磷地力养分丰缺指标为<5、5～10、10～20、20～50、>50 mg/kg;钾地力养分丰缺指标为<40、40～80、80～150、150～300、>300 mg/kg。与第2次土壤普查相比,玉米土壤碱解氮含量中高水平增加30～100 mg/kg;有效磷含量基本不变;速效钾含量中低水平下降10～20 mg/kg,高水平增加100 mg/kg。玉米氮肥利用率18.8%,磷肥利用率40.1%,钾肥利用率37.9%。
The 384 maize field experiments were carried out in Yunnan province, and the soil nutrient rich-lack index and fertilizer use effi- cieney on maize were established. The results indicated that the nutrient rich-lack index of nitrogen was 〈 50, 50 -90, 90 - 150, 150 -250 and 〉 250 mg/kg, with the rank of very low, low, medium, high and very high level. Phosphorus rich-lack index was 〈 5, 5 -10,10 - 20,20 - 50 and 〉 50 mg/kg, and potassium rich-lack index was 〈 40, 40 - 80, 80 - 150, 150 - 300 and 〉 300 mg/kg. Compared with the Second Soil Survey, nutrient content of nitrogen increased by 30 - 100 mg/kg in medium and high level, phosphorus was the same, and po- tassium reduced for 10 -20 mg/kg in medium and low level, but rose by 100 mg/kg in high level. Fertilizer use efficiency of nitrogen, phosphorus and potassium were 18.8 % ,40, 1% and 37.9 %, respectively.
出处
《西南农业学报》
CSCD
北大核心
2013年第1期203-208,共6页
Southwest China Journal of Agricultural Sciences
基金
农业部测土配方施肥补贴资金项目
关键词
玉米
土壤养分
丰缺指标
肥料利用率
Maize
Soil nutrients
Rich-lack index
Fertilizer use efficiency
