南疆粘性、砂性土壤陆地棉中前期缩节胺化控比较研究

对粘性土壤和砂性土壤棉田的陆地棉在苗期(约6叶期)、一水前、二水前缩节胺用量进行了研究。结果表明,砂壤土陆地棉苗期缩节胺用量在1 00g/667m2,二水前为1 50g/667m2,而一水前在变化范围较大(2 00～4 00g/667m2)的情况下,获得单株铃数7 50个以上的几率最大;砂性土壤棉田苗期不施缩节胺,一水前用量为1 50g/667m2,二水前用量为3 75～6 00g/667m2时也可获得单株铃数7 50个以上,但获得单株铃数7 50个以上的组合数较少,而苗期缩节胺用量为0 20～0 60g/667m2获得单株铃数7 50个以上的组合不存在。粘性土壤棉田陆地棉苗期和一水前的化控量宜轻,二水前的化控量在变化范围较大(0 00～3 00g/667m2)的情况下,获得单株铃数6 50个以上的几率最大;苗期缩节胺用量为1 00g/667m2,一水前3 00g/667m2,二水前化控量0 00～3 00g/667m2也可获得单株铃数在6 50个以上,但获得单株铃数6 50个以上的组合数较少。

Study on Comparison of Chemical Control about DPC in Early-middle Period on Cotton Field of Clay Soil, Sand Loam Soil on Upland Cotton in Nanjiang

Use level of DPC (N,N-dimthy piperidinium chioide) was conducted at seedling stage (about sixth leaf period), at pre-first water, and pre-second water of Upland cotton (CRI123) on cotton field of sand loam soil and clay soil. The results indicated that for sand loam soil, possibility of high boll number (more than 7.50/plant) was the largest on condition of use level of DPC of 1.00 g/667 m~2 at seedling stage, 1.50 g/667 m~2 at pre-second water and 2.00～4.00 g/667 m~2 at pre-first water. Boll number more than 7.50/plant might be obtained on condition of use level of DPC of 0 g/667 m~2 at seedling stage, 1.5 g/667 m~2 at pre-first water and 3.75～6.00 g/667 m~2 at pre-second water, but the possibility was little. Crosses on boll number more than 7.50/plant could be not obtained on condition of use level of DPC of 0.20～0.60 g/667 m~2 at seedling stage. For clay soil, the possibility of high boll number (boll number was more than 6.5/plant) was the largest on condition of little uselevelofDPCatseedlingpreiodofUplandcottonandpre-first-water,andtherewerelargerrange(0.00～3.00 g/667 m~2) of use level of DPC at pre-second-water. Athougth boll number more than 6.50/plant might be alsoobtained,therewerelittlercrossesforbollnumbermorethan6.50/plantonconditionofuselevelofDPCof 1.00 g/667 m~2 at seedling stage, 3.00 g/667 m~2 at pre-first water and 0.00～3.00 g/667 m~2 at pre-second-water.