欢迎您！东篱公司
退出
-
申报数据库
-
立项数据库
-
成果数据库
-
项目获奖数据库
中文摘要：
在陕西关中地区研究了有限灌溉与旱地蓄水保墒栽培相结合的不同栽培模式和施氮量对冬小麦-夏玉米轮作体系中硝态氮残留的影响。结果表明，种植五季作物后不同栽培模式0—200cm土壤剖面残留硝态氮平均在218～329kg／hm^2之间，且残留的硝态氮主要集中在100-200cm土层。不同栽培模式相比，垄沟模式0—200cm土层的硝态氮残留量最高。随着种植年限和施氮量的增加，0-200cm土层硝态氮残留量随之显著增加。施用240kg／hm^2氮肥，第五季作物收获后0—200cm土层硝态氮的残留量达477kg／hm^2；从第三季作物收获到第五季作物收获，残留硝态氮的增加量占这一时期氮肥施用量的比例高达51．6％。种植作物五季后，常规、节水和覆草模式在0—80cm土层硝态氮残留量相对较低，而80cm以下土层硝态氮残留量随着施氮量的增加明显增加。垄沟栽培模式在0—200cm土壤剖面残留硝态氮的量随施氮量增加显著增加，且在0—120cm土层硝态氮残留量明显高于其它模式。
英文摘要：
A field experiment was conducted in Guanzhong region of Shaanxi Province to investigate the effects of different cultivation methods of water saving irrigation and water conservation and nitrogen rates on soil residual nitrate N under winter wheat-summer maize cropping rotation system. At the fifth crop harvesting, 218-329 kg/ha residual nitrate N was found in 0-200 cm depth of soil under different cultivation methods, most of them existed in 100-200 cm depth of soil. Compared with other cultivation methods, the residual nitrate N in 0-200 cm depth of soil under the furrow planting system was the highest. Soil residual nitrate N significantly increased with the increase of cultivation years and N application rates. When N 240 kg/ha was applied, the residual nitrate N in 0-200 cm depth of soil was about 477 kg/ha at the fifth crop harvesting. The increase amount of residual nitrate N from third harvesting to fifth harvesting was 51.6 % of the total amount of applied nitrogen during this period. After the fifth crop harvesting, the amount of nitrate accumulation in 0- 80 cm soil profiles under conventional, water-saving and straw mulching cultivation method was lower and increased below 80 cm depth when N fertilizer was applied. The amount of nitrate accumulation in soils under the furrow planting cultivation method was very high when N fertilizer was applied in 0-200 cm soil profiles, and was higher in 0-120 cm soil profiles than other cultivation methods.
同期刊论文项目
同项目期刊论文
期刊信息
位置：