Ziyunying, also known as red flower grass, is a major green manure planted in South China. After sowing, the temperature was higher in the early stage and it entered the cold freezing weather in January this year, which is extremely unfavorable to the growth of the purple sage. Therefore, we must do a good job of field management, promote the long spring, and increase the output of fresh grass.
First, prevent waterlogging. Ziyunying has a moist and moist character, and is afraid of drought and waterlogging. Therefore, water must be managed throughout the growth period to ensure that the soil has a certain degree of humidity. In the rainy seasons of winter and spring, we must do a good job of clearing the ditch and drain the ditch, clear the gullies, gutters, and gutters in the fields of Ziyunying, and eliminate water and waterlogging in time.
Second, anti-removal fertilizer. Milk vetch is a legume green manure that is particularly sensitive to phosphate fertilizers. Phosphorus deficiency can affect the yield of fresh grass, and it is also unfavorable to the growth of post-plant crops. Therefore, it is necessary to add 20-25 kg of phosphate fertilizer to the field without application of phosphate fertilizer, and the output of fresh grass can be increased by 40-50 kg per kg of superphosphate. After spring, the plots with poor potential for seedlings can also be topdressed with some available nitrogen fertilizers, spreading 4 to 5 kg of urea or 15 to 25 kg of ammonium bicarbonate per mu. Generally, they can collect more than 500 kg of fresh grass. In addition, 0.1%~0.2% potassium dihydrogen phosphate solution can also be sprayed on the fields left by Ziyunying to increase the seed production.
Third, antifreeze. Timely selection of a sunny day with no rain and a slight rise in temperature, and proper irrigation of some horse water can prevent the damage from dry freeze.
Fourth, pest prevention. Diseases of Ziyunying mainly include sclerotinia, powdery mildew, turnpea and leaf blight. Sclerotia were found during the growth period. The diseased plants should be removed in time and burned with lime in the center of the disease. For powdery mildew and rotten spot disease, a 0.4-degree lime sulfur spray can be used, and a 1:5 limestone lime powder can also be used. The insect pests of Ziyunying mainly include locusts, thrips, leafminers, etc. Generally, green fertilization fields are controlled once and the field is controlled for 3 to 4 times. For each mu, 0.4 to 0.5 kilograms of mixed grass powder and 8 to 10 kilograms of leaf ash are available.è¶ Spray in the morning when dew does not dry, or use 40% dimethoate emulsion, or 50% malathion 200 g water 45-50 kg spray control. In the rainy days, we must also pay close attention to spraying without the use of rain. In particular, we must spray pesticides on farms to increase seed production.
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