摘要
将牛粪有机肥施入岩溶地区的土壤中,研究牛粪中氮、磷、钾元素在土壤-甜高粱（Sorghum dochna）系统中的分布与利用规律。施肥水平为1、2、3、4和5kg·m^-2,以化肥和空白分别为对照。结果表明,当牛粪施入量为4kg·m^-2时,土壤对全氮、全磷的保持能力均为最高,土壤氮、磷含量分别为523.07和110.39mg·kg^-1;当施入量为3kg·m^-2时,土壤对钾元素的保持能力最高,速效钾和全钾含量分别为74.5mg·kg^-1和4.19g·kg^-1;当牛粪施入量为3kg·m^-2时,甜高粱对全氮的消纳能力最强,为313.71mg·kg^-1;当施入量为4kg·m^-2时,甜高粱对全磷的消纳能力最强,为93.00mg·kg^-1;当施入量为2kg·m^-2时,甜高粱对钾元素的消纳能力最强,为18.6mg·kg^-1;随着有机肥施肥量的增加,甜高粱生物产量先增加后下降,当施入量为4kg·m^-2时,甜高粱生物量达到最高,为132.84kg,再增加牛粪施入量则产量略微下降;因此,3～4kg·m^-2是土壤-甜高粱系统的最优施肥量。
In order to improve the soil fertility and analysis the digestion and utilization ability of soil-forage system for the cow dung nutrient in the karst regions in Chongqing, we studied the distribution and utilization of N, P, K elements in the soil-sweet sorghum system by applying cow dung into the soil-sweet sorghum system. This research employed different fertilization levels by 1, 2, 3, 4, 5 kg·m^-2, and com- pared with a fertilizer control group and a blank control group. When the cow dung applied with 4 kg·m^-2 , the ability of soil keeping total nitrogen, total phosphorus were highest with 523.07 mg·kg^-1 soil nitrogen and 110.39 mg·kg^-1 phosphorus content. When the cow dung applied with 3 kg ·m^-2, the ability of soil maintaining potassium was highest with 74.5 mg·kg^-1 rapidly-available potassium and 4.19 g·kg^-1 total potassium content. When the cow dung applied with 3 kg·m^-2 , sweet sorghum had strongest absorption of total nitrogen which was 313. 71 mg kg·m^-2 , sweet sorghum had strongest absorption of total·kg^-1. When the cow dung applied with 4 phosphorus which was 93.00 mg·kg^-1. Whenthe cow dung applied with 2 kg·m^-2 , sweet sorghum had strongest absorption of potassium which was 18.6 mg·kg^-1. Sweet sorghum biomass increased firstly and then dropped with the increase of organic fertilizer. When organic fertilizer applied with 4 kg· m^-2 , sweet sorghum had highest biomass of 132.84 kg. The biomass slightly decreased when more cow dung applied. Based on our research, 3～4 kg·m^-2 was the optimal fertilizer rate of the soil-sweet sorghum system.
出处
《草业科学》
CAS
CSCD
北大核心
2014年第5期935-942,共8页
Pratacultural Science
基金
2013年重庆高校创新团队建设计划"肉牛现代化生产技术"
科技支撑计划项目"三峡库区优质肉牛安全生产关键技术集成与示范(2011BAD36B01)"
关键词
重庆岩溶地区
牛粪有机肥
土壤-甜高粱体系
消纳
养分
karst regions in Chongqing
cow dung organic fertilizer
soil-sweet sorghum system
digestionand utilization
nutrition
