Applying fertilizer to control disease soil loose Chinese yam should pay attention to the key points of high yield management.

Paying attention to several key links in the production and management of Chinese yam will greatly improve the planting efficiency of Chinese yam. In the cultivation and management of Chinese yam, we should focus on the application of base fertilizer, loose soil, seed treatment of Chinese yam, timely topdressing, disease control, and take measures to promote the growth of the rhizome of Chinese yam as far as possible.

Chinese yam sowing

First, the soil is loose and the tuber is easy to expand.

Soil looseness is very important for rhizome elongation and expansion. The planting ditch is about 1 meter deep, sandy loam, loose and breathable, raising temperature quickly, early seedling is good, which is conducive to yam tuber elongation; clayey soil is cold and hard, poor air permeability, not conducive to root elongation, but sufficient fertility. No matter what kind of soil, each mu can be mixed with more than 1000 kg of cow and horse manure or crushed crop straw (wheat straw, rice husk is also OK), which can not only increase soil organic matter, but also improve soil permeability. The large stones, tiles and gravel in the soil should be removed so as not to damage the roots. It is best to dig trenches before freezing, which is conducive to weathering soil and has a good soil structure. The sooner the irrigation, the better to raise the ground temperature as soon as possible.

Second, the base fertilizer should be fully used and the plastic film should be covered.

Apply more than 3000 kg of rotten chicken and duck manure or pig and sheep manure per mu, more than 50 kg of potassium sulfate compound fertilizer, and about 50 kg of diammonium phosphate. If possible, add 100 kg of biological bacterial fertilizer and bean cake fertilizer and 1 kg of boron, zinc and iron fertilizer, which are fully mixed with the soil and filled in the planting ditch. After filling with water, the seeds can not be sown until the ground temperature rises to 15 ℃. After sowing, plastic film should be covered to increase temperature and preserve soil moisture. At the end of May, the membrane should be removed and the root of the root should be fixed.

Third, the seedlings should be treated to prevent diseases and insects.

Chinese yam is easy to be infected with root rot and blight after sowing, and the easiest way is to deal with yam species. The species of Chinese yam can be soaked with 1000 times of fipronil (Shile) or 1500 times of Amisi, and sprayed along the ditch before sowing to ensure that the yam does not die at the seedling stage.

There are many underground pests in spring, mainly mole cricket, golden needle worm, grub and ground tiger. The more effective method is to spray phoxim 1500 times along the ditch. Or using high concentration Ruisheng (thiazide) spray ditch to control underground pests, the effect is better and the safety is higher.

Fourth, protect stems and leaves in the middle stage, pay attention to three items.

Chinese yam to the middle of growth, more rainy days, high humidity, easy to cause anthracnose, brown spot, nail spore leaf spot, brown rot, virus. Can be used Amicida 1500 times plus copper noble 600x spray, once every 15 days, spray 2-3 times. Brown rot can be irrigated by the above methods, especially after heavy rain. Virus diseases focus on the control of whitefly and mites. Pay attention to the topdressing of chemical fertilizer, in the middle of growth, topdressing 2-3 times, about 25 kg of potassium sulfate compound fertilizer per mu. Pay attention to timely removal of yam beans to reduce nutrient consumption.