施用大中型沼气工程沼液对冬小麦-夏玉米作物产量的影响OA

Based on the actual demand for intensive agricultural waste consumption and fertilizer reduction,the effects of liquid digestate wholly or partially substitution of chemical fertilizer on crop yield of the winter wheat-summer maize rotation system were studied.Four liquid digestate treatments(T1 to T4),four liquid digestate partial substitution of chemical fer-tilizer(T5 to T8),conventional chemical fertilizer treatment(CF),and control treatment without fertilizer(CK)were set up.The results showed that the yields of wheat and maize increased first and then decreased with the increase of liquid di-gestate addition.In the winter wheat growing season,liquid digestate partially substitution of chemical fertilizer can in-crease the spike number to improve the yield and avoid prolonging the growth period.The appropriate amount of fertilizer is 240 t·ha-1 liquid digestate plus 300 kg·ha-1 chemical fertilizer,and the yield of wheat is 7937 kg·ha-1.In the summer maize growing season,liquid digestate wholly substitution of chemical fertilizer can promote the growth of silage maize to in-crease yield,and appropriately prolong the growth period to improve freshness.The appropriate amount of fertilizer is 90 t·ha-1liquid digestate,and the yield of silage maize is 16351 kg·ha-1.Under the crop yield is higher than conventional chemical fertilizer treatment,the maximum amount of liquid digestate on wheat and silage maize is 240 t·ha-1 and 120 t·ha-1,respectively.The maximum annual capacity of liquid digestate is 360 t·ha-1 in the winter wheat-summer maize ro-tation system.This study provided theoretical and technical support for fertilization in winter wheat-summer maize rotation system,and the popularization and application of liquid digestate in crop production for large-scale biogas projects.