摘要
高寒半干旱栗钙土农田水肥耦合效应明显。供水量为250 ~450 m m 条件下,氮磷合理配施改善了地上部生物学性状,促进了地下部根系发育;供水350 m m N120 P90 处理0 ~40c m 根重密度最高,达1317 mg/cm 3 , P45 较 N60 根重密度增加0067 ~0375m g/cm 3 。供水为150 m m 的干旱年型,水分是限制作物生产的主导因素,而供水250 ~450 m m 年型主导因素则是土壤营养不足。供水量350 m m N120 P90 处理作物水分利用效率最高,可达727kg/( m m ·h m 2) , N60 P90 氮肥利用率最高,子粒和植株分别为4818 % 和8817 % , N120 P45 磷肥利用率最高,子粒和植株分别为2113 % 和3042 % 。水肥合理耦合有效地提高了作物产量和水肥利用率。
The effect of field water fertilizer coupling was very significance in chestnut soil in semi arid region with cold and high elevation. Under amounts of water supply 250~450mm, the concerted use of nitrogen and phosphate fertilizer could improve biological characteristics of aerial part, and promote root system development of subsurface part. The treatment of water supply 350mm and N 120 P 90 had the highest density of root weight which was 1 317mg/cm 3, and under water supply 250~450mm the density of root weight increased 0 067~0 375mg/cm 3 using P 45 than that N 60 . Water was the main factor limited crop productivity in dry year of water supply 150mm. In other years of water supply 250~450mm the deficient nutrition was the main limiting factor. The treatment of water supply 350mm and N 120 P 90 had the highest water use efficiency which was 7 27kg/(mm·hm 2), N 60 P 90 had the highest nitrogen use efficiency which were 48 18 and 88 17 percent seperately in grain and plant of naked oat, the highest phosphate use efficiency was in N 120 P 45 which were 21 13 and 30 42 percent seperately in grain and plant. So rational water fertilizer coupling could raised effectively the yield and water and fertilizer use efficiency.
出处
《植物营养与肥料学报》
CAS
CSCD
1999年第3期227-234,共8页
Journal of Plant Nutrition and Fertilizers
基金
国家"九五"重点科技攻关项目
关键词
水肥耦合
栗钙土
水分利用效率
Water fertilizer coupling
Chestnut soil
Naked oat
Water use efficiency
Fertilizer use efficeincy