Chemical regulation and breeding of strong seedlings of direct seeding rape before overwintering

Cultivating dwarf and strong seedlings overwintering is the basis of high yield of rape. Paclobutrazol and uniconazole are broad-spectrum plant growth regulators. Using paclobutrazol or dilute paclobutrazol to cultivate strong seedlings can enhance stress resistance, which is an indispensable key technology. The use of paclobutrazol and dilute paclobutrazol is as follows: in mid-December, when direct seeding rape reaches 4 leaves, 50 grams of 15% paclobutrazol wettable powder per mu, 50 liters of water, 11 grams of 5% uniconazole wettable powder and 50 liters of water are used.