Why Garlic Leaves Yellow During the Next Year

The garlic farmers in Yutai County, Shandong Province, reported that the garlic seedlings in recent years were basically normal. In the second year, the leaves were yellowed. Although there were not many deaths, the yield was greatly reduced. I do not know what caused it. of. In response to this problem, the author and Yan Jing, a very experienced peasant expert in the locality, Yan Yan Village, Luotun Township conducted a discussion.

Mr. Yan Jingyin understands that the roots of all garlic plants with yellow leaves are basically yellow-brown. Lighter on sandy lands and heavier on clay ground. When yellow, pouring water can ease over. After watering, the yellowing of the leaves was aggravated. For continuous plots, the yellow leaves are heavier. Yan Jing therefore concluded that the yellowing of garlic leaves was caused by too much fertilizer.

According to Yan Jingyin's analysis, the author believes that the yellowing of the garlic leaves in the Yutai County is mainly caused by the following causes: more than 150 kg of chemical fertilizer per acre, and the concentration of the aqueous solution is too large, causing burning roots to affect the absorption function; Shallow, with the tractor rotary plough turning to the depth of less than 10 centimeters, the lower stratum of the soil compacted, rain or water, the water can not seep, accumulate on the surface, resulting in the soil can not timely infiltration of chemical fertilizer to the underground layer, in the garlic Excessive concentration of the solution near the root causes root burning. Because of the good permeability of sandy land, a large amount of chemical fertilizer penetrates into the lower layer of the soil, which reduces the concentration of soil solution and reduces the burning of roots. Watering can reduce the concentration of soil solution, so it has the effect of relieving the yellowing of the leaves. Continuous plots not only have high soil solution concentrations, but also have root rot, blight, and other disease hazards, resulting in yellowing of the leaves. The control method is as follows.

1. Loose soil. In the future, the soil should be deeply ploughed. If you use a rotary plough to plow, you can use 100 grams of soil conditioner immediately before sowing, add 100 kg of water, and spray 1 mu of ground with a sprayer. Within 20 days after spraying, the depth of 50 cm soil can be loose and transparent, which will greatly increase the water seepage and water holding capacity and prevent water damage.

2. Appropriate amount of fertilizer. Fertilizer application should take a small number of times. Fertilizer dosage should not exceed 50 kg/mu.

3. Watering. After dead seedlings occur, cold groundwater should be poured immediately to reduce ground temperature and prevent high temperature damage to the roots. On the one hand, cool groundwater has higher oxygen content, which can reduce the risk of root asphyxia; at the same time, it can reduce the concentration of soil solution. .

4. Rotate crops to prevent root rot and blight.

5. Before sow planting, 5 to 6 kg of carbendazim or thiophanate methyl disinfectant is used per acre.

6. In the early spring, when spraying green natural pigment, Shuofeng 481, it enhances the photosynthesis of chlorophyll and promotes the production of plant nutrients.

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