1. Seedling transplanting
Implement sash positioning, quantitative quenching and ultra-sludge sowing, and cultivate strong seedlings, and adopt the supporting measures of "five systems and two points":
(1) Fine land preparation: the seedbed should be selected from the leeward sun, the land is fertile, the management is convenient, and the sandy loam soil of the cruciferous crop has not been planted before, and the soil is fine and there is no large clods;
(2) Pulling the line: It is required to have a width of 134-150 cm, a groove width of 30 cm, a ditch depth of 25-30 cm, and a fat foot in the end.
(3) Grid frame positioning, binning quantitative, ultra-dilute seeding: a square fence with a width of 134-150 cm is prepared. The size of the grid is 12X12 cm. The fence is placed on the side of the box and is smeared with clear animal waste. The topsoil is immediately sown by grid, and the number of germinated seeds per germination is 1-2. After sowing, it is advisable to cover the seeds with grass ash or fine sieved slag, and pay attention to drought resistance and drainage;
(4) Timely seedlings: When the rapeseed grows to 1-2 leaves, the seedlings are started, and the seedlings are transferred and diluted. One strong rapeseed seedlings are left per grain. At the same time, attention is paid to pest control and fertilizer management, and the manure is applied during the seedbed period. 3 times, control 1-2 times, 25-30 days transplanting;
(5) Spraying paclobutrazol in time: When growing to 3 leaves, spray paclobutrazol to control seedling height, increase green leaf area and increase yield per unit area. Generally, use paclobutrazol 15010-6-20010-6 per acre, 60 kg of leaf surface. Spray.
2. High density planting
Zhongtian 2040 cm; Ueda 2044 cm, and the implementation of the wrong point double plant equidistant transplanting, reaching the technical requirements of low-nitrogen high-density planting of 1.4-1.6 million plants per mu. When transplanting, remove the high-foot seedlings, the curved neck seedlings, the diseased insects and the delicate seedlings, and plant the roots and fertilizers while planting to ensure the whole field of the seedlings.
When planting double plants, the seedlings must be transplanted separately. The spacing between the plants and the plants is 10-15 cm. It is not possible to nurse seedlings, otherwise it will cause lodging and affect the yield.
3. Adjust the proportion of fertilization to achieve scientific fertilizer
The application time of nitrogen fertilizer should be mastered before December, and it is best not to apply nitrogen fertilizer after December. Fertilization measures should be taken: "bottom foot, stable seedling, attacking, and rearing up":
"Bottom foot" is mainly applied organic fertilizer and phosphorus and potassium fertilizer, supplemented by nitrogen fertilizer, accounting for about 70% of the total fertilization amount, 1500 kg of organic fertilizer, 3.4 kg of phosphorus pentoxide, 6.8 kg of potassium oxide, 3.4 kg of pure nitrogen. The opening of the fertilizer accounted for 28%, the use of pure nitrogen 2.2 kg, phosphorus pentoxide 1.4 kg, potassium oxide 2.7 kg;
Steady seedling fertilizer accounted for 2%, using 0.15 kg of pure nitrogen, 0.1 kg of phosphorus pentoxide, and 0.19 kg of potassium oxide.
The above two fertilizers must be applied before the year.
"Post-filling" is mainly based on micro-fertilizer. In the early stage of flowering, the plant is sprayed with 0.1% boron fertilizer solution and 0.1% potassium dihydrogen phosphate solution. It is sprayed once at the end of the flowering stage from the bud to the initial flower. Spraying 60 kg of fertilizer solution can play the role of full weight gain.
4. Strengthen management
In the seedling stage, it is necessary to pay attention to the drainage of the ditch, control pests such as aphids, cabbage caterpillars and downy mildew, cultivating and weeding 1-2 times or chemical weeding once. In the middle and late period, the disease prevention and anti-aging is the main factor, and the force is removed in time to deteriorate the disease environment. In the early flowering stage, the bacteriostatic disease should be controlled by carbendazim and other pesticides. After the flowering, the drought occurs. It should be properly watered and drought-resistant. At the same time, 0.5 kg of urea can be used. 0.1 kg of potassium dihydrogen phosphate was sprayed with 100 kg of water to prevent premature aging.
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