摘要
对太湖地区典型水稻土———黄泥土进行了12年的长期定位不同施肥试验,并保持化肥的施用水平与本地区常规施用量相当。对12年来的肥力变化与不同施肥小区的肥力差异的分析研究表明,长期单施化肥下土壤耕层中养分都有所下降,且表层土壤养分的下降量不及亚表层土壤,年际间生产力不稳定。化肥配施有机肥(秸秆还田或猪粪),可长期保持土壤中的养分,稳定提高作物生产力;有机无机配合施肥下12年间全碳和全氮分别增加1.1g/kg和3.0g/kg,而全磷提高了0.3g/kg以上。同时也表明,表层土壤全氮的增加明显地促进了有机碳的固定。
In Liuyang of Hunan, with the field trials, the effect of B on agronomical character and economic of fluecured tobacco were studied. The results showed that B didn＇t influence the leaf width, leaf long, leaf area and yield, but had significant effect on grade composition, production value and average price. With 900～1500 g/hm^2 Borax being sprayed at rosette stage, production value, average price and upper grade tobacco leaf were respectively increased by 1189.5～4095.0 yuan/hm^2, 0.98～1.49 yuan/kg and 12.8～15.5 percentage points, and lower grade tobacco leaf was decreased by 10.8～16.3 percentage points.
出处
《土壤肥料》
CSCD
北大核心
2005年第4期28-32,共5页
Soils and Fertilizers
基金
国家自然科学基金重点项目(40231016)
江苏省自然科学基金重点项目和教育部人才基金项目联合资助.
