Effect of Sheep Manure Returning to Field on Yield and Quality of Silage Maize and Soil Fertility
In order to achieve the resource utilization of sheep manure in standardized breeding farms,a cycle model of planting and breeding was constructed,and a cultivation experiment of silage maize was conducted in Jingmen City.Five treatment groups(100%fertilizer,75%fertilizer + 25%sheep manure,50%fertilizer + 50%sheep manure,25%fertilizer + 75%sheep manure,and 100%sheep manure)were set up,so as to explore the effect of sheep manure returning to the field and the proportion of sheep manure replacing fertilizers on the yield and nutritional quality of silage maize and the soil fertility.The results are as follows.(1)As the proportion of sheep manure replacing fertilizers increases,the content of organic matter,total nitrogen,alkaline nitrogen,available potassium,and available phosphorus in the soil show an increasing trend.Compared with the 100%fertilizer group,the content of the above indicators in the 100%sheep manure group is significantly increased by 8.35%,5.68%,7.46%,7.51%,and 10.53%(P<0.05),respectively.The soil bulk density shows a decreasing trend.Compared with the 100%fertilizer group,the soil bulk density in the 100%sheep manure group significantly drops by 5.56%(P<0.05).(2)With the increase in the proportion of sheep manure replacing fertilizers,the yield of silage maize first increases and then decreases.The yield of the 75%fertilizer + 25%sheep manure group is the highest,which is 5.58%higher than that of the 100%fertilizer group(P<0.05)and 20.89%higher than that of the 100%sheep manure group(P<0.05).(3)With the increase in the proportion of sheep manure replacing fertilizers,the content of crude protein and crude fat,as well as the relative feeding value(RFV)of silage maize increase first and then decrease,with 75%fertilizer + 25%sheep manure group the highest.The crude protein is increased by 7.81%(P<0.05)compared with the 100%fertilizer group and 15.53%(P<0.05)compared with the 100%sheep manure group.There is no significant difference in crude fat of the 100%fertilizer group.The crude fat is 16.13%higher than the 100%sheep manure group(P<0.05).There is no significant difference in RFV of the 100%fertilizer group,and it is increased by 18.82%compared with the 100%sheep manure group(P<0.05).In summary,25%of sheep manure replacing fertilizers can not only improve soil fertility but also improve the yield and nutritional quality of silage maize.
NETL
NSTL
万方数据
