Soil properties. First consider the nitrogen supply level of the soil itself, and apply nitrogen fertilizer according to local conditions. According to the condition of soil fertility, the amount of fertilization is determined, the plot with high fertility is less applied, and the plot with low fertility is applied more. The proportion of nitrogen fertilizer allocated to medium and low fertility fields is greater than that of high fertility fields. Because the yield-increasing potential of the medium-low fertility field is greater than that of the high-fertility field, according to the results of the national multi-year fertilizer test, the middle and low field yields 4 kg of rice per kg of nitrogen, 5 kg of wheat and 5.5 kg of corn, which is higher than that of high-yield land. Great potential.
The soil also has strong selectivity for different types of nitrogen fertilizer. The acidic soil can be selected from alkaline fertilizer and physiological alkaline fertilizer and neutral fertilizer, such as ammonia water, ammonium hydrogencarbonate, urea, calcium nitrate and the like. The application of nitrogen fertilizer on sandy soil should be carried out in small amounts, the base fertilizer is less applied, the number of top dressing is increased, and it is not suitable for the application of nitrate nitrogen fertilizer.
The nutritional properties of the crop. Crops are also selective for nitrogen fertilizers, and different crop types have different choices for the shape and variety of nitrogen fertilizers. Cereal crops such as rice, wheat, sorghum, and corn, as well as cotton, vegetables, and fruit trees are crops that require more nitrogen. The application rate of nitrogen fertilizer should be larger. Bean crops such as soybeans and peanuts have rhizobium symbiotic nitrogen fixation, and nitrogen requirements are not urgent, and nitrogen fertilizer can be applied less or not.
Different varieties of the same crop have different fertility requirements. Hybrid rice and japonica rice in rice have more roots and more nitrogen than conventional rice.
The soil also has strong selectivity for different types of nitrogen fertilizer. The acidic soil can be selected from alkaline fertilizer and physiological alkaline fertilizer and neutral fertilizer, such as ammonia water, ammonium hydrogencarbonate, urea, calcium nitrate and the like. The application of nitrogen fertilizer on sandy soil should be carried out in small amounts, the base fertilizer is less applied, the number of top dressing is increased, and it is not suitable for the application of nitrate nitrogen fertilizer.
The nutritional properties of the crop. Crops are also selective for nitrogen fertilizers, and different crop types have different choices for the shape and variety of nitrogen fertilizers. Cereal crops such as rice, wheat, sorghum, and corn, as well as cotton, vegetables, and fruit trees are crops that require more nitrogen. The application rate of nitrogen fertilizer should be larger. Bean crops such as soybeans and peanuts have rhizobium symbiotic nitrogen fixation, and nitrogen requirements are not urgent, and nitrogen fertilizer can be applied less or not.
Different varieties of the same crop have different fertility requirements. Hybrid rice and japonica rice in rice have more roots and more nitrogen than conventional rice.
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