Effects of different bandwidth and row ratios on yield and nitrogen efficiency of maize/soybean by relay strip intercropping
To explore the optimal bandwidth and row ratios of maize/soybean by relay strip intercropping,a field experiment was conducted.Five bandwidth and row ratios treatments were set up with monocropping maize(MM)and soybean(MS)as the control.There were 2 m bandwidth with maize/soybean row ratio 2∶2(treatment 1),2.4 m bandwidth with maize/soybean row ratio of 2∶3(treatment 2)and 2∶4(treatment 3),2.8 m bandwidth with maize/soybean row ratio of 2∶3(treatment 4)and 2∶4(treatment 5).The effects of these treatments on yield and nitrogen use efficiency of maize and soybean were studied.The results showed that the grain yield of maize de-creased gradually with the increase of bandwidth,and the grain yield of soybean increased gradually with the in-crease of bandwidth.Under the same bandwidth condition,the grain yield of maize was declined with the increase of maize/soybean row ratio,and the grain yield of soybean showed an increasing trend.The changes of nitrogen uptake and use efficiencies of maize and soybean were consistent with changes of grain yields.The harvest index of maize and soybean at the treatment 2 were increased,accompanied by increased nitrogen allocation ratio to grains and de-creased nitrogen allocation ratio to stems.Considering the characteristics of grain yields,economic benefits and the nitrogen uptake,allocation and use efficiency,its suggested that the optimal maize/soybean relay strip planting pat-tern with 2 rows of maize and 3 rows of soybean under 2.4 m bandwidth was the optimal intercropping mode for maize/soybean in the mountainous area of southwest Hubei Province.
bandwidth and row ratiomaize/soybeanrelay strip intercroppingyieldnitrogen efficiency
万方数据
维普
