RESEARCH ON PRODUCTIVITY AND RESOURCES UTILIZATION RATE OF VARIOUS MULTIPLE CROPPING PATTERNS IN HUANG HUAI PLAIN
黄淮平原不同多熟模式生产力特征与资源利用效率研究

The three cropping patterns, i.e., winter wheat/spring corn/summer corn/autumn corn, winter wheat/spring corn/summer corn, and winter wheat summer corn, were analyzed from aspects of yield, resources utilization rate and economic benefit in the paper. The results showed that yield of all the three cropping patterns could surpass 15t/ha, indicating the reality of reaching 15t/ha in Huang Huai PLain under condition of intensive multiple cropping system. The yield differences among the three cropping patterns showed that intensive multiple cropping and reasonable adjustment techniques were effective ways to further increase field annual yield in this region. The highest yield of winter wheat/spring corn/summer corn/au tumn corn reached to 22.01t/ha, which was one of the effective cropping patterns to near or to top 22.50t/ha with present techniques. For cropping pattern of winter wheat/spring corn/summer corn/autumn corn, the key to yield increase was due tothe total ears added; the high assimilation rate could be maintained and light heat resources utilization rate could be increased by effective measures in combination with transplanting and other relevant practices. The economic benefit was reflected in high input/high output, but some indexes of output to input rate tended to be declining.Comprehensive judgment from the viewpoint of yield, net income, material expenses and labor employed indicated that winter wheat/spring corn/summer corn/autumncorn pattern had advantages in general.