甘蔗/ 大豆间作模式的生产力分析

通过田间试验对比分析了甘蔗单作、大豆单作及甘蔗/大豆间作3 种种植模式下杂草数量、土壤养分情 况、作物的产量及土地当量比。结果表明院（1）甘蔗/大豆隔行间作模式中，田间杂草数为16.5~25.0 株/m2，而单作甘蔗 田间杂草数为40.0~45.0 株/m2，对比单作甘蔗，甘蔗/大豆隔行间作模式田间杂草数量显著减少；（2）在甘蔗/大豆隔行 间作模式中，土壤全氮、全磷、速效钾、速效磷分别提高0.03 g/kg、0.058 g/kg、0.1344 mg/kg 和5.34 mg/kg，表明间作模 式对土壤肥力有一定的改善作用；（3）甘蔗/大豆隔行间作模式下，甘蔗出苗率及甘蔗产量表现同甘蔗单作相比没有 明显差异，合理间作大豆对甘蔗生长没有负面影响；土地当量比为1.39~1.63，具有较强的间作优势。

Study on growth trend of short-season cotton transplanted without root media after wheat harvest under different densities

The experiment investigated the vegetative and reproductive growth trends and seed cotton yield of short. season cotton transplanted without root media after wheat harvest under different planting densities during 2008-2010. The results showed that dry stem weight per plant, dry leaf weight per plant, leaf area per plant and leaf area index had similar growth trends, accumulating the highest value between late August and early September, and the highest values of dry vegetative organ weight and leaf area per plant of low density (22 500~45 000 plants/hm2) were apparently higher than those under high density (11 250~13 500 plants/hm2), and leaf area index was positively correlated with density. Dry square weight and square number per plant accumulated to the highest values in middle August, and the highest values of 22 500~ 45 000 plants/hm2 were overtly greater than those of 90 000~11 250 plants/hm2. Boll number per plant was the most in early September. Total seed cotton yield and seed cotton yield before frost were highest under 90 000 plants/hm2 density in 2008-2010.