After the sewage treatment, putting the wet sludge in which the heavy metal content is extremely low, corrupt and broken straw, bentonite, urea in proportioning according to the certain ratio, mixing well-distributed,...After the sewage treatment, putting the wet sludge in which the heavy metal content is extremely low, corrupt and broken straw, bentonite, urea in proportioning according to the certain ratio, mixing well-distributed, taking the shape of Nitrogen slow-release fertilizers, doing the dynamic bioleaching test by the method of Artificial rainfall simulation, researching the slow-release characteristic, water retention. When the mass ratio of the wet sludge whose water content is 82.5%: bentonite: corrupt and broken straw: urea is 62.5: 12.5: 12.5: 12.5, drip washing the 10g Nitrogen slow-release fertilizers by the 80ml distilled water after 48h, the residue rate of urea is 29.63%; Under the room temperature of 25 ℃, 77%RH, moisture evaporate 46.32% after 60 h. The results demonstrate that the slow-release fertilizer has a good release-effect of nitrogen and water conservation effect. It provides the basic for the development and application of the sewage in the aspect of Nitrogen slow-release fertilizers.展开更多
以施氮量调控氮代谢,提高氮肥利用率为目标,利用15 N研究了包膜尿素(CU100、150和225kg/hm2)和普通尿素(150和225kg/hm2)对夏玉米产量、生物量、氮肥利用率以及各器官氮分配的影响。结果表明:包膜尿素比普通尿素显著增加玉米从肥料中的...以施氮量调控氮代谢,提高氮肥利用率为目标,利用15 N研究了包膜尿素(CU100、150和225kg/hm2)和普通尿素(150和225kg/hm2)对夏玉米产量、生物量、氮肥利用率以及各器官氮分配的影响。结果表明:包膜尿素比普通尿素显著增加玉米从肥料中的吸氮量,显著增加地上部生物量;15N包膜尿素肥料利用率(15NUE,nitrogen use efficiency)显著高于普通尿素;15N包膜尿素在玉米器官的分配与普通尿素有差异,前者从肥料中吸氮量为籽粒>叶片>秸秆>玉米芯>苞叶,而后者为籽粒>秸秆>叶片>玉米芯>苞叶;非标记时,2种肥料在玉米器官的分配顺序相同,都为籽粒>叶片>秸秆>玉米芯>苞叶。玉米地上部吸氮量、籽粒氮收获指数和籽粒产量没有因不同氮肥形态和施氮量而产生显著变化,这可能是前茬冬小麦季节温度低,冬小麦吸氮少,收获后残留土壤的NO3-N含量高,所以夏玉米吸氮量主要受自身生长势或生长速率控制,受肥料种类和施氮量的影响较小。展开更多
文摘After the sewage treatment, putting the wet sludge in which the heavy metal content is extremely low, corrupt and broken straw, bentonite, urea in proportioning according to the certain ratio, mixing well-distributed, taking the shape of Nitrogen slow-release fertilizers, doing the dynamic bioleaching test by the method of Artificial rainfall simulation, researching the slow-release characteristic, water retention. When the mass ratio of the wet sludge whose water content is 82.5%: bentonite: corrupt and broken straw: urea is 62.5: 12.5: 12.5: 12.5, drip washing the 10g Nitrogen slow-release fertilizers by the 80ml distilled water after 48h, the residue rate of urea is 29.63%; Under the room temperature of 25 ℃, 77%RH, moisture evaporate 46.32% after 60 h. The results demonstrate that the slow-release fertilizer has a good release-effect of nitrogen and water conservation effect. It provides the basic for the development and application of the sewage in the aspect of Nitrogen slow-release fertilizers.
文摘以施氮量调控氮代谢,提高氮肥利用率为目标,利用15 N研究了包膜尿素(CU100、150和225kg/hm2)和普通尿素(150和225kg/hm2)对夏玉米产量、生物量、氮肥利用率以及各器官氮分配的影响。结果表明:包膜尿素比普通尿素显著增加玉米从肥料中的吸氮量,显著增加地上部生物量;15N包膜尿素肥料利用率(15NUE,nitrogen use efficiency)显著高于普通尿素;15N包膜尿素在玉米器官的分配与普通尿素有差异,前者从肥料中吸氮量为籽粒>叶片>秸秆>玉米芯>苞叶,而后者为籽粒>秸秆>叶片>玉米芯>苞叶;非标记时,2种肥料在玉米器官的分配顺序相同,都为籽粒>叶片>秸秆>玉米芯>苞叶。玉米地上部吸氮量、籽粒氮收获指数和籽粒产量没有因不同氮肥形态和施氮量而产生显著变化,这可能是前茬冬小麦季节温度低,冬小麦吸氮少,收获后残留土壤的NO3-N含量高,所以夏玉米吸氮量主要受自身生长势或生长速率控制,受肥料种类和施氮量的影响较小。
