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该试验采用正交、拉丁方及随机区组设计,于1983～1986年在盖县的3个乡进行了复因子灌水与追肥和单因子追肥试验,以期获得杨树丰产林的增产效益。通过方差分析,只有灌水与追肥的A_2B_2C_3处理,胸径生长量显示出差异显著,而其他各试验均证明在本试验条件下追肥无效。A_2B_2C_3处理较对照增产7％,平均每株增加0.54元,实际经济效果不理想。试验表明,在生长季节降雨量600mm以上,土壤平均含水量16％以上,土壤肥力中等以上的沙至沙壤土的立地条件上,栽植杨树丰产林不必追肥与灌水。本文为生产单位提供了不可盲目追肥、灌水的理论依据。
The experiment was designed by orthogonal, Latin square and random block design. In 1983 ~ 1986, three experiments were conducted in three counties in Gaixian to study the effects of multiple factors irrigation and top dressing and single factor top dressing on the yield increase of poplar high yield forest. By ANOVA, only the irrigation and dressing A_2B_2C_3 treatment, DBH growth showed significant differences, while other tests have proved that top dressing in this test conditions is invalid. The yield of A_2B_2C_3 was 7% higher than that of the control, with an average increase of 0.54 yuan per plant. The actual economic effect was not satisfactory. Experiments show that in the growing season of rainfall above 600mm, the average soil moisture content of 16% or more, soil fertility moderate to above sand to sandy loam site conditions, planting poplar high yield forest without top dressing and irrigation. This article provides the production unit can not blindly top-dressing, irrigation theory.