Effects Of The Density,SCI And Sowing Dates On Yield And Quality Of The Intercropping System With Maize And Soybean

The experiment was carried out in the GuiZhou University in 2006, the multi-quadric regressive orthogonal rotary combination design was applied at experiment. Guinuo7 of the corn, and Qiaoqiaohuang of the soybean were selected to research the effects of the intercropping on total yield and quality and its physiological characteristics, and set up mathematics models, analyzed mathematics models and relationship between each cultural factor and yield; analyzed a series of index about physiological characteristics, which worked out the ideal combination of each factor and a reasonable range of each factor. The results are as follows:(1)the set cultivating program of the intercropping system of maize and soybean is: density of maize47983～5681 individual plant per hm~2, SCI2 : 4~ 2 : 2, sowing dates between maize and soybean 15～22,total yield≥8793 kg per hm~2. We can also gain the primary and secondary order of factors: density >sowing dates between maize and soybean>SCI.(2) increasing the com density to all have the exaltation function to the yield, but the effect curve of the com density is a parabola, existing one reasonable rang, the effect of sowing dates between Corn and Soybean , SCI were negative effect: the shorter sowing dates between corn and soybean, the more yield increases ;the lower SCI, the more yield raise, the longer sowing dates between corn and soybean, the less yield increase; the higher SCI ,the less yield increase. Density of maize 51000individual plant per hm~2, SCI 2 : 2 ,the sowing dates between maize and soybean of 20 of combination 12 the total yield is the highest, that is to say, the total yield is higher 8.24% than the level of control 1 ,is higher 28.83% than the level of control 2. (3)the protein, dissolubility sugar, fat, starch of maize with the density increment but decrease, with the sowing dates between maize and soybean extension but descend, with the SCI enlarge but reduce. The thick fat content of soybean descend, the protein is increment, moreover, the starch is no descend obviously.(4)the disposal of high-grade and heavy- produce , the main physiologic index is sound: photosynthesis potency is higher, dry matter accumulate is more, leaf area index is bigger and duration is longer, a department of vitality ,the chlorophyll content are higher, these disposals full of light energy to produce photosynthesis matter, take a good basis of improving yield and quality of intercropping of Maize and Soybean.