Effect of applying PP₃₃₃ to cotton roots with drip irrigation under film-mulching and new chemical control technology

There is an obviously improved yield in cotton fields after applying PP₃₃₃ to its roots, compared to CK, which improved 15 percent and more. As to its physiological aspects, the canopy structures gets rational, the hight of cotton plant becomes appropriate, and it is shortened by 5～7.5 cm, than CK. The high data of chlorophy11 keeps long and the injury of plasma lemma is slight. All of these ensured that cotton have not been dying too early. According to experiments, appropriate concentration is from 36 g to 72 g (Unit: pure PP₃₃₃ mass/hm², the follows are same), and the best is about 54 g/hm². But for the over-growing cotton field, the concentration ought to have a promotion. However, the biggest concentration should never above 90 g. The chemical control technology for dripping irrigated cotton was discussed, and some new measures, which are spring growth accelerators on leaves and dripping growth retardant on roots with water, was brought out, at the same time (from aspect of spatial); Technology of accelerating cotton growth during seedling period, inhibiting growth during blooming-boll, and the second times accelerating during the latter time of cottons growth stage(from aspect of time) was put forward.