摘要
确定土壤有效磷供应临界值,对于菜田磷素推荐具有重要的参考价值。蔬菜根系浅、根长密度低的特征,以及受反季节设施栽培的影响,导致了大多数蔬菜对土壤有效磷供应强度的要求明显高于粮食作物。本研究汇总分析了近20年来发表的20余篇相关中文文献及在北京郊区的试验结果,计算了主要蔬菜的氮磷钾养分吸收参数及吸收比例,采用线性加平台方程拟合获得了一般菜田土壤有效磷的供应临界值,并对其影响因素进行了剖析。结果表明,在当季不施有机肥条件下,北方露地菜田土壤有效磷的供应临界值为27.0 mg/kg P;果类蔬菜的土壤有效磷供应临界值为56.7 mg/kg P,明显高于叶类蔬菜的临界值39.1 mg/kg P;施用有机肥显著降低了露地菜田土壤有效磷供应临界值;设施菜田土壤有效磷供应临界值高于同样施用了有机肥的露地菜田。
The determination of the critical soil available P value plays significant role in P recommendation in vegetable fields.Most vegetables,with the characteristics of shallow root system and low root length density,especially under off-season cultivation in protected field,required high P supply level,in comparison to cereal crops.The paper summarized the results on crop responses to soil P fertility from 20 published papers and selected field trials in the last 20 years,in order to get the critical value of soil available P supply in vegetable fields.The results showed that the critical value of soil available P in open field of North China without manure as basal fertilization was 27.0 mg/kg P,the critical value of soil P value in fruit vegetable was 56.7 mg/kg P,significantly higher than that of leafy vegetable 39.1 mg/kg P.The critical value of soil available P in-season decreased with manure application.The critical value of soil available P in protected fields was higher than those in open fields with manure.
出处
《华北农学报》
CSCD
北大核心
2012年第B12期345-353,共9页
Acta Agriculturae Boreali-Sinica
基金
果类蔬菜产业技术体系北京市创新团队及公益性行业(农业)科研专项"农作物最佳养分管理技术研究与应用"(201103003)
关键词
蔬菜
有效磷
临界值
磷素吸收
推荐
Vegetables
Soil available phosphorous
Critical value
Phosphorous uptake
Recommendation
