Increasing Potassium Fertilizers The mid-birth period of rice growth is the most vigorous period for rice to absorb potassium during its lifetime, and it is also the period for accelerating the maximum efficiency of nutrients. Potassium application at this time has the following three functions: (1) To ensure the nutritional balance of rice, promote the development of young panicles, and increase grain number to increase grain weight, thereby increasing yield. (2) to promote the thick stalks, thickening of the epidermis, improve resistance to lodging and lodging resistance. (3) It can improve the rhizosphere environment of rice, promote root respiration and favor the development of young panicles. The amount of potash fertilizer must be determined based on the content of available potassium in the soil. For low-potassium rice fields (ie, soil content below 80 mg/kg), if the transplanter has already applied 5 kilograms, 5 kilograms will be applied in the mid-fertility period; if not before planting, Apply 10 kg of potassium per acre. The medium potassium (ie, the effective potassium content of the soil is 80 to 100 mg/kg) is applied only once in the paddy field before transplanting or mid-fertility, and the available potassium is 7 to 8 kg per mu. For high-potassium paddy fields (ie, the available potassium content in the soil is above 100 mg/kg), no additional application is required. Potassium fertilizer is used during and after the cob's differentiation. The method of application can be used alone, or it can be mixed with the early panicle fertilizer and nitrogen fertilizer. Reasonable irrigation To do a good job in the mid-birth period of rice irrigation, we need to do the following three measures: First, to ensure good water layer, the period of young panicle differentiation of rice is the period of physiological water demand, when the field surface to keep the water layer, supply rice Adequate moisture; Second, the water layer should not be too large. The water layer over the ambassador's lower section of the rice stretches excessively, becomes thin and soft, not only easy to fall down, but also the base section is fine, the number of grains per spike is small, and the empty rate is high. Spike differentiation should still be implemented in shallow water irrigation, generally irrigation 5 to 7 cm. The method of irrigating Wangshuiwangshui and irrigating the next water is more appropriate. Third, pay attention to soil ventilation. The period of young panicle differentiation is also a period of vigorous growth of rice roots. On the one hand, it develops in depth, and on the other hand, a large number of points occur. Branch roots. However, due to the high temperature at this time, the soil is prone to strong reduction reactions in the case of flooding, resulting in harmful substances that damage the root system of rice, causing root rot and premature aging. Therefore, special attention should be paid to soil ventilation while maintaining the water layer. The specific methods are as follows: 1 In general, paddy fields must supply soil oxygen by means of intermittent treatment, that is, irrigating water once or twice, drying for one or two days, and closely combining field surface water conservation with soil ventilation; 2 high groundwater level, daily For paddy fields with a leakage of less than 1 cm, the drainage channels should be dredged to reduce the groundwater level and enhance soil infiltration. 3 To properly extend the drying time for paddy fields with large amount of organic fertilizers or rice straws and root rot. Putting roots at the top of the list. (Jining Rencheng District Agricultural Bureau)
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