The Optimum Spacing Dam Model of Basin Tilage on Various Sloping Fields

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Effect of Plant Type on Grain Yield of Maize Hybrid Grown in Different Densities

The grain yield variation among 18 maize crosses with the upright, medium and patulous plant type in the close, middle and thin densities was studied in Heilongjiang province. The upright crosses with leaf orientation value more than 45 and leaf length-width ratio more than 7.5 showed adaptation to close planting. The higher leaf orientation value and leaf length-width ratio of upright crosses would play their parts to yield independently only in the close density in the test (95200 plants/ha). In the thin and middle density treatments the upright crosses yield no more than medium and patulous ones.