摘要
本文通过5年的定位试验研究结果表明：松嫩平原典型黑土农田养分自然供给力N素为90％左右，P素为95％以上，K素达到100％农田土壤中N素的释放量一般55－99kg／ha·a，P素的释放量一般14－26kg／ha·a，K素的释放量一般48－93kg／ha·a。尽管黑土农田潜在肥力很高，对于施肥的依赖性也在不断增加。5年不施N，其自然供给力由90％左右下降到60％左右；不施P，其自然供给力由95％以上下降到80－90％。
5-year-fixed experiments indicated that spontaneous nutrientsuppling capacihes of typical black soil in Song Nen Plain were : nitrogen, around 90%, phosphorus, over 95%; and potalsium, 100%. The amounts of N, P and K released from farmland were 55- 99 kg / ha. year, 14- 26 kg / ha. year and 48- 93 kg / ha. year seperately. Although black soil farmland has rather high potenhal fertility, its dependence on ferhlizahon is rising gradually. The spontaneous supplying capacity of nitrogen decreased from 90% to 60% in the treatment with no nitrogen appling during the 5 years, and that of phosphorus declined from 95% to 80-90% in the treatment without phosphorus applicahon during the 5 years.
出处
《土壤学报》
CAS
CSCD
北大核心
1997年第3期295-301,共7页
Acta Pedologica Sinica
关键词
自然供给力
释放量
养分平衡
黑土
Spontaneous supply capacity, The amount of release, Nutrient balance
