Study On Application Effect Of New Soil Conditioner In Silage Corn In Coastal Plain

In view of the low plain in Hebei Province water resources shortage and soil saslinization,groundwater especially deep groundwater is seriously overexploited,change the traditional planting structure and mode,development of low water alternative crops and increase yield by improving soil quality is the important measures to realize the sustainable development of agriculture in Hebei Province.With the rapid development of animal husbandry in China and the increase in demand for high-quality silage forage grass,actively responsing to national"grain to feed"policy and promoting the whole-plant silage maize development,it has become the effective agricultural development gripper.In order to optimize the varieties of silage maize in the coastal plain of Heibei Province and solve the key technical problems in planting,In the Huanghua Plain,by applying different amounts of new liquid soil conditioners to the two preferred silage maize varieties,selecting local high-yield varieties and reasonable soil conditioner dosages,provide reference and basis for future research and promotion.The main results are as follows:(1)The effects of new liquid soil conditioners on soil physical and chemical properties.The application of soil conditioner can reduce soil bulk density,increase soil water holding capacity and saturated water content,and reduce particles with particle size<0.5?m,0.5-1?m and<2?m in soil,thereby increasing soil porosity and improving soil structure,K3 and K4 treatment have the best effect;For the soil water storage in various soil layers,the application of soil conditioner can increase the total water storage capacity of 0-100 cm soil during the key growth period of silage corn,especially for the water storage of 0-40 cm soil layer;And can reduce the value of salt content and conductivity in the soil.(2)The effects of new liquid soil conditioners on aronomic characteristics and yield of silage corn.Compared with the non-applied treatment,the emergence rate of silage corn was improved to some extent;The treatment of soil conditioner had a certain promoting effect on the silage corn height,which was significant at the end of the jointing stage to the beginning of the silking stage;The treatment of soil conditioners can increase the leaf area index of silage corn,for Aoyu silage 5102,K2 treatment was significantly higher than other treatments at each growth stage after seedling stage,for Jinzhu 100,the leaf area index was larger when treated with K3 and K4,but only significantly higher than K1 at the end of jointing and at the end of silking;The soil conditioner can significantly increase the yield of silage corn,and it has a greater impact on the treatment of K2,which is 23.1%,5.78%and 1.23%higher than K1,K3 and K4,respectively.For Jinzhu 100,K3 treatment had a greater impact on yield,which was 36.25%,17.31%and 6.57%higher than K1,K2and K4 treatments,respectively.In terms of physical and chemical properties of soil,soil conditioner has a better effect on soil improvement when treated with K3 and K4.In terms of the yield increase effect of crops,Aoyu silage 5102 and Jinzhu 100 were treated with K2 and K3 respectively,which had the best yield increase effect and economic benefit;Aoyu silage 5102 has good applicability in this area,and it can be effectively increased with the application of soil conditioner at 30 kg/hm~2.It is recommended to strengthen the planting in the test area.