摘要
田间试验在湖南的衡山县和长沙县进行,探讨了不同肥力水平水稻土上水稻控释氮肥对早、晚稻的增产效果和肥料氮利用率。结果表明,在肥力水平较低的水稻土上施用水稻控释氮肥对水稻的增产效果极为显著,应当增加施用量;在肥力水平较高的水稻土上,水稻吸收土壤氮较多,肥料氮的吸收量与增产作用自然减少,应适当减少施用量。不同肥力水平的土壤上水稻控释氮肥较等氮量尿素增产4.4%～16.4%。较无氮区增产13.8%～74.5%。水稻控释氮肥在不同肥力水平土壤中早、晚稻的利用率为69.7%～86.9%,平均比等N量尿素高37.6%,且水稻控释氮素利用率的高低与土壤肥力水平有关。水稻控释氮肥作一次性全量基肥施用,氮素生产效率明显高于尿素,是增产的主要原因。
Field experiments were conducted in Changsha and Hengshan county of Hunan province. Yield increase efficiency and nutrient utilization of controlled-release nitrogen fertilizer in different paddy soils was studied. Results showed that it could be profitable to determine rate of controlled-release nitrogen fertilizer according to the basic fertility level of paddy soil. It was recommended that the amount of rice controlled-release nitrogen fertilizer should be increased in paddy soils of low fertility. The amount should be decreased in paddy soils of high fertility. The Yield of rice by controlled-release N fertilizer application (90 kgN/ha) was 4.9%-16.4% higher than the urea treatment of equal N amount, was 13.8%-60.9% higher than no N plot among different basic soil fertility level. Nitrogen recovery of rice controlled-release nitrogen fertilizer was changed in the ranged from 69.7%～86.9%, and was 37.5% higher than that of urea treatment with 90 kgN/ha by early rice and later rice in different basic soil fertility level. N recovery of controlled-release nitrogen fertilizer was related with soil fertility level. One time application of controlled-release nitrogen fertilizer had higher physiological and agronomic efficiency.
出处
《土壤通报》
CAS
CSCD
北大核心
2003年第2期115-119,共5页
Chinese Journal of Soil Science
基金
湖南省"九五"重大攻关项目(99NKY1004-07)
农业部"九五"重点攻关项目
农业部"948"项目经费资助
关键词
水稻控释氮肥
土壤肥力
水稻产量
氮素利用率
Controlled-release nitrogen fertilizer
Soil fertility
Rice yield
N recovery
