| Strip-width is one of the important factors that influence the Nutrition Accumulation and Competition, Dry Matter Accumulation and Distribution and Grain Yield in Maize and Soybean relay strip intercropping System as it can change System’s microclimate and it is also one important factor that influences the mechanical work. While previous studies on Strip-width were rare and not systematic. In this article Effect of Strip-width on Nutrition Accumulation and Competition, Dry Matter Accumulation and Distribution and Grain Yield in Maize and Soybean relay strip intercropping System were studied within 7 different Strip-width plant patterns (1.6m,1.7m,1.8m,1.9m,2.0m,2.1m and 2.2m). The results showed as follows:1 Different Strip-widths had significant effect on Crop Nutrition Accumulation and Competition in Maize and Soybean relay strip intercropping System. In terms of Nutrition Accumulation result:with the increase of Strip-width Nutrition(N P K) Accumulation of system first increased then decreased, NA of maize decreased for narrowed plant distance decreased maize per plant DMA and NA of soybean first increased then decreased; From low to high(A5) was caused by increased per plant DMA, plant number and Nutrition Content due to the increased spaces between maize and soybean and from high(A5) to low was caused by decreased per plant DMA and plant number due to very narrowed pant distance. Under 7 different Strip-widths N, P and K Competive Ratios (Maize to Soybean) were ranged 1.3-3.6,1.2-3.6,1.3-3.2 for 2012 and ranged 1.1-2.3,1.2-2.6,1.1-2.3 for 2013 and all turned to be first decreased then increased with the increase of Strip-width, Which showed that Maize had stronger Nutrition Competiveness than Soybean and this unequal Competition can be affect by the change of Strip-width. When Strip-width was 2.0m Maize and Soybean had the most equilibrious competitiveness as the Competive Ratios of N, P and K were all smallest and most close to 1 and the system had the biggest Nutrition accumulation. In terms of Nutrition Accumulation process:with the increase of Strip-width per plant NA of Maize had the same change rules at different growth stages always turning to be decreased as per plant DMA decreased while per plant NA of Soybean had different performance at different growth stage, before 90 days after Soybean’s seeding it turned to be increased and after that it turned to be first increase then decreased mainly due to the change of per plant DMA.2 Different Strip-widths had significant effect on Crop Dry Matter Accumulation and Distribution in Maize and Soybean relay strip intercropping System. In terms of Dry Matter Accumulation results:with the increase of Strip-width System DMALER first increased then decreased, Maize DMA decreased as per plant DMA decreased due to narrowed plant distance and soybean DMA first increased then decreased; From low to high(A5) was caused by increased per plant DMA and plant number due to the increased spaces between maize and soybean and from high(A5) to low was caused by decreased per plant DMA and plant number due to very narrowed pant distance.2.0m was thought to be the Strip-width that had the biggest production potential as it had highest DMA and DMALER. In terms of Dry Matter Accumulation process:with the increase of Strip-width DMA of Maize had the same change rules at different growth stages always turning to be decreased as narrowed plant distance had enhanced the intraspecific competition while DMA of Soybean had different performance at different growth stage, before 90 days after Soybean’s seeding it turned to be increased due to the increased distance between Maize and Soybean and after that it turned to first increase then decreased; From low to high(A5) was caused by the increased spaces between maize and soybean and from high(A5) to low was caused by very narrowed pant distance as bigger plant body had enhanced intraspecific competition. In terms of Dry Matter Transportation and Distribution:with the increase of Strip-width Dry Matter Translocation Amount and Ratio of Vegetative Organs, Dry Matter Distribution Ratio to Grain for Maize all decreased, and same indicators of Soybean all turned out to be first increased then decreased.3 Different Strip-widths had significant effect on Crop Grain Yield in Maize and Soybean relay strip intercropping System. With the increase of Strip-width System GYLER first increased then decreased; Maize GY decreased as per ear seed number and productive ear number decreased due to narrowed plant distance and soybean GY first increased then decreased; From low to high(A5) was caused by increased per plant seed number and productive plant number due to the increased spaces between maize and soybean and from high(A5) to low was caused by decreased per plant seed number and productive plant number due to very narrowed pant distance. When the strip-width <2.0m, with its increase GY reduction amplitude compared to sole crops were low and grew slowly for intercropped Maize while decreased quickly for intercropped Soybean and Systems had higher comprehensive GY. When the strip-width reached 2.0m with its further increase the GY reduction amplitude of Maize and Soybean both turned to be higher and grew fast and Systems’comprehensive GY also decreased.2.0m was thought to be the most appropriate Strip-width as it had the highest GY (2012:9.62×103kg/hm2, 2013:7.39×103kg/hm2), and the biggest GYLER (2012:1.6,2013:2.1). |
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