This year's autumn and winter temperatures are higher than normal years, rapeseed seedlings grow vigorously, and some maintain the growth trend of Tian Ersheng after entering the wintering period. There are already 15 green leaves in the rapeseed seedlings in some fields along the Yangtze River. At present, rapeseed has entered the wintering period, and the plants are green and the growth rate is not reduced. Such as Dezao 11th, January 3rd survey: the average number of green leaves reached 15.4, more than 90% of the bolting, the moss height of 13.2 cm, the moss stem is 2.46 cm thick, the opening degree is 95.2 cm, obviously growing too strong. Such seedlings tend to be early and early, and at the same time, they are vulnerable to low temperature freezing when the temperature drops sharply in winter.
Management method for rapeseed growth
1. Pick up the moss early and apply fertilizer. For rapeseed fields that have early early flowering, it is necessary to remove the main moss in time, reduce the inefficient consumption of nutrients, promote the formation of first and second branches, and make up for the loss of production. Generally, the moss is picked up on a sunny day, and the cold tide is not suitable for picking the moss, so as to prevent the wound from being rotted and infected. After picking the moss, 5 to 10 kg of urea is applied per acre, and 10 kg of ternary compound fertilizer is applied. The canola that has been removed from canola is edible or used as a green feed for livestock.
2. Cultivate loose soil and damage root system. For the field where there are signs of early moss and early flowering, the cultivating loose soil is used to damage part of the root system and delay the early flowering of early moss. The cultivating pine can cut off the roots of some rapeseed and inhibit the growth of rapeseed, thus delaying the growth process of rapeseed. For the soil with poor soil fertility, long age, and transplanted high-stem seedlings, some fertilizers can be properly applied.
3. Spray plant growth inhibitors. For the base fertilizer, the nitrogen fertilizer is more, and the seedlings are prosperous, and the plant growth regulator can be used for chemical control. Generally, 50g of 15% paclobutrazol can be sprayed on the leaf surface with 50g of water.
Main pests of pest control: The pests of rapeseed are mainly aphids and leaf miners.
Control method: 40% dimethoate or 40% omethoate 1000-2000 times solution, 20% eucalyptus 1000-1400 times solution, 50% sputum fog wettable 3000 times solution, 40% sulphur sulphur Phosphorus emulsion 1500 times solution, 2.5% enemy killing emulsion 3000 times solution, and the like. Aphid control can also set up yellow boards in rape fields, trap and kill aphids, or use bee, grasshoppers, ladybugs, scorpion flies and other organisms.
In addition, we must do a good job in field management such as clearing ditch drainage, spreading grass ash, and anti-freezing.
More pesticide knowledge , please pay attention to China Pesticide Network
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