| In this study, we use three factors split-split plot experimental design.The main plots are three different branched type of varieties (lines)(dong-81735Few-branched, dong-2176mid-branched, dong-0331Multi-branched).First splits are divided into the four planting densities(10、20、30and35Ten thousand·hm-2). And then the split-split is divided into four kinds of fertilization(900、700、500and300kg·hm-2). We have systematically studied on the impact of different density and fertilization and photosynthetic characters on the yield of different branched types of soybean varieties. Research has shown that three varieties under different density and fertilizer combination:In the48treatments,there are12treatments more than3500kg·hm-2,and all of them are the combination of high density(B4), cigaomi (B3), high fertilizer(C4), and second high fertilizer (C3). Multiple comparisons analysis results show that optimal yield combination is b3c4a2, b4c3a2, b3c4a3, and the difference in yield between community is not significant, but significantly higher than the other combinations. That which can reach a high yield of processing is composed of high density, high density and high fat, high-fat treatment combination, this suggests soybean yield potency which should be at a high density and sufficient fertility can be realized.Different types of soybean under different cultivation conditions, group LAI (leaf area index) is unimodal curve and maximum values appear in full pod R4. Photosynthetic potentcy also reaches a peak at this time, chlorophyll content and photosynthetic intensity in the late drum size R6reach peak, photosynthetic rate in all processing is up to (a2b3c3) or151.5mg·dm-2·h-1. Photosynthetic productivity of photosynthesis is up to the highest in full flowering pod prime, is lowest in full pod to seed-filling stage, there is little difference in various periods. NET light close productivity of changes appears two peak in soybean full reproductive period, respectively in full flowering pod prime and drum grain period, the previous peak appears in the most strong period of plant growth, large quantity spent pod need large nutrient, the main is nutrition growth; the other peak appears in late swelling stage, the main is reproductive growth. Although this grain has reached the maximum, but the fat and protein macromolecules is still in accelerating accumulating period, this period to meet the various nutrients required for plant growth, maintain remaining late high photosynthetic rates is important for improvement of yield and quality, this is not main causes of premature soybean yield and higher quality.In the whole life of soybean, biomass accumulation can be expressed as:from seedling to branch for the exponential growth of biomass, grain is straight from branch to drum growth period, and then enter a period of stability. Flower Swelling stage is maximum accumulation period for the dry matter, accumulation in whole growth period is more than80per cent. Pod prime is an advantage for growth, at this point a lot of flowers and pods need plenty of nutrients, drum size is an advantage foe reproductive growth, leaves absorb more light energy conversion in the grain. Selecting fine varieties on the production, appropriately increasing planting density and fertilizer application, improving the volume and accumulation of dry matter accumulation rate, can effectively increase soybean production. |
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