植物生长调节剂和密度对小麦主要性状的调控效应

Effects of Plant Growth Regulators and Density on Major Characteristics of Wheat

田间试验探究植物生长调节剂和密度对小麦新品种鄂麦352株高、抗倒性、产量等的影响。结果表明,随着密度增加,株高增加,倒伏加重,群体穗数增加,穗粒数减少,产量以基本苗225万.hm-2较高且比较稳定。喷施250 mg·kg-1的多效唑和喷施200 mg·kg-1的矮壮素,都降低了株高,提高了抗倒性,但以喷施250 mg.kg-1的多效唑的效果较好。喷施250 mg·kg-1的多效唑具有明显的增产效果,其增产原因在于提高单位面积的有效穗数,基本保持穗粒数不减少、千粒重不下降。鄂麦352控制密度225万.hm-2左右,结合起身拔节前喷施250 mg·kg-1多效唑,能获得较高产量。而矮壮素的效果还需要进一步研究。

A field experiment was conducted to study the effects of plant growth regulators and density on plant height, lodging resistance and yield of wheat variety E352. The results showed that as the density increased, plant height, lodging level and ear number per plot increased, but the grain number per ear decreased. A higher yield was available with 2.25× 10^4 plants per hm^2. When spraying with PP333 at the concentration of 250mg per kilogram or CCC of 200 mg per kilogram, plant height was reduced, but lodging resistance was enhanced. Compared with CCC, the treatment of PP333 showed better. Moreover, when spraying with PP333 at the concentration of 250mg per kilogram, ear number per plot increased, but the grain number per ear and 1000 grain weight didn＇t decrease, sequently the yield increased. For E352, an ideal yield could be achieved, with a preferable combination of planting 2.25×10^4 plants per hm^2 and spraying with PP333 at the concentration of 250mg per kilogram before elongation stage. The role of CCC needed further study.