The "double low" mustard "six defenses"

"Double-low" rapeseed showed good quality with low erucic acid content in the oil and low glucosinolate content in the cake, and the planting area showed a rapid development trend. Compared with ordinary rapeseed, "double low" rapeseed has relatively slow growth, sensitivity to boron, weak photosensitivity and poor resistance. In production, we must focus on "six defenses":

Prevent mixing. To focus on contiguous planting, it is important to remember that planting with conventional rapeseeds cannot be done to avoid bunching each other. The distance between the isolation area and other canola is preferably 100 meters away. Eradication of conventional rapeseeds (including the adjacent plants in the green field and other winter crop fields) should be promptly eradicated. Cruciferous vegetables such as Chinese cabbage and radish are not allowed to bloom at the same time as rape.

Prevent early death. The first is to timely sowing. Transplanting seedlings, medium-maturing varieties were sown around mid-September, and early maturing varieties were sown at the end of September and early October. Live cultivation was delayed one week later than transplanting of the same variety. The second is to rape rape that has a tendency of early infestation and use one-tenth of the paclobutrazol solution per acre.

Prevent pests. "Two-low" rapeseed varieties have weaker resistance to (resistant to) sclerotinia, so we must use varieties with relatively strong resistance (resistance), and try to make seeds as free from bacteria, not as heavy as weeds, and as far as possible. Fields do not suffer from flooding and fields are not shaded. After the spring, we should do a good job of draining the gutters, remove the diseased leaves, yellow leaves, and old leaves in time, and apply a single dose of medicine for protection at the early flowering stage and flowering stage of rape respectively. The water can be sprayed on the middle and lower parts of the plant with 40% Rhizoctonin or 70% carbendazim. For aphids, cabbage caterpillars, beetles and other insect pests, mu can be sprayed with 10% imidacloprid or 40% omethoate.

Rat-proof birds. "Double-low" rapeseed has low content of glucosinolates, and mice and birds like to eat it. After sowing, they often appear seedless due to the harm of rats. Therefore, in regions where the rodent damage is more serious, it is best to spray a pair of trichlorfon on the surface of the car after sowing. To prevent bird damage, you can insert a scarecrow in the field, hang a plastic sheet or bamboo poles to catch the bird.

Freezing damage. Before winter, in the rapeseed between the rows of soil, covered with mixed fertilizer, big seedlings Bacon, strong seedlings Pei Xin, seedlings covered roots. Before the fertilization, the cultivator loosens the soil to remove the bentonite compaction, improve the permeability, and increase the temperature of the topsoil. After the cultivating, a wax fertilizer is re-used to improve the cold-resistance, disease resistance and lodging resistance of the rapeseed. Generally, 1-1.2 tons of pig cow manure or 2-3 tons of earth fertilizer is applied per acre and foliar potassium dihydrogen phosphate is applied 100 -150 grams. Roots after fertilization to facilitate warming. Before the onset of frost damage, a layer of crop stalks or a layer of turfgrass ash shall be placed on the rapeseed in order to reduce the damage caused by cold winds. Before the cold current comes, pour water once to stabilize the temperature and prevent it from freezing. The irrigation after freezing should be carried out at noon on a sunny day so that the topsoil covered by the frozen protrusions is solid, ensuring that the roots of the rape are in close contact with the soil. After the cold has passed, the seedlings should be checked in time and the frozen seedlings should be cultivated in time to help the seedlings. In case of rain and snow, the water in the field was excluded as soon as possible. Immediately after thawing, plant ash or spray fresh water on the leaves to prevent water loss.

Prevent boron deficiency. At present, "double low" rapeseed varieties are generally more sensitive to boron than conventional rapeseed, and are likely to cause dead leaves, flowers, and other unreal consequences. Attention should be paid to boron. According to the research, the application amount of boron fertilizer per acre for planting "double low" rapeseed in our province is 200-250 g borax. It is best to spray boron fertilizer at seedling stage and flood season. Boron should not be delayed sooner. Boron fertilizer is used as base fertilizer and should not be directly contacted with seeds (live) or young roots (transplanted). Paddy fields should, in principle, apply boron fertilizer annually. In regions with severe boron depletion, boron fertilizer should be applied before the late evening of rape in the late stage of rapeseed. The post-emergence stage (before and after flower bud differentiation) and convulsing stage (15-30 cm in height) is the key period for boron spraying. Once, the concentration of 0.2% -0.3% boron fertilizer solution is appropriate.

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