The fertilizer is preferably a mixture of available nitrogen and phosphorus. Use 750~1000 kg of human excrement per acre, and mix it with about 500 kg of clear water and fill it at about 5 pm. 500 grams of potassium dihydrogen phosphate per acre, first dissolved in warm water, then mixed with 500 kg of water, watered in the crack. Use 2.5 kg of urea per acre, 10 kg of superphosphate, dissolve with a small amount of water, and irrigate 500 kg of water. After dissolving 100 kg of grass ash per acre, soak for 5 hours, filter out impurities, and fill the roots with 500 kg of water.
Go to the field to see the cracks, look at the leaf color, look at the variety, and then determine the top dressing time. If the sweet potato ridge surface begins to crack and the leaf color fades, the top dressing can be carried out. Topdressing time: Generally, the summer sweet potato is suitable for “beauty potato†and “white dewâ€; autumn sweet potato is suitable for “white dew†and “autumnâ€.
Method: Choose cloudy or sunny days in the evening. The fertilizer should be thoroughly mixed, and the concentration of the fertilizer should be prepared according to the weather and the dry and wet conditions of the soil. The dry soil should be thinner and the soil should be thicker. It is necessary to apply it along the cracks one by one, and strive to be uniform and avoid leakage. At the same time of chasing the cracked fertilizer, the sweet potato foliar application of grass ash 100 kg / mu to supplement the potash fertilizer, can improve the application effect of crack fertilizer.
Go to the field to see the cracks, look at the leaf color, look at the variety, and then determine the top dressing time. If the sweet potato ridge surface begins to crack and the leaf color fades, the top dressing can be carried out. Topdressing time: Generally, the summer sweet potato is suitable for “beauty potato†and “white dewâ€; autumn sweet potato is suitable for “white dew†and “autumnâ€.
Method: Choose cloudy or sunny days in the evening. The fertilizer should be thoroughly mixed, and the concentration of the fertilizer should be prepared according to the weather and the dry and wet conditions of the soil. The dry soil should be thinner and the soil should be thicker. It is necessary to apply it along the cracks one by one, and strive to be uniform and avoid leakage. At the same time of chasing the cracked fertilizer, the sweet potato foliar application of grass ash 100 kg / mu to supplement the potash fertilizer, can improve the application effect of crack fertilizer.
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