Rice spikes should apply panicle and granular fertilizers
Rice ear stage refers to the rice growing period from heading to maturity in rice. This stage is the key period for determining the number of grains and grain weight of panicle. Therefore, strengthening field management at the earliest stage is an important means to seize the harvest of rice.
Main target:
The main objectives of field management are: to raise roots, preserve leaves, increase grain, and increase weight. In terms of cultivation, we should grasp the key measures of “rooting roots with air, protecting leaves with roots, and keeping grain with leaves†and preventing greediness and lodging.
Science Management Water:
The principle of irrigation during the heading and grain-filling period of rice is: "Footwater (1 inch or so in shallow water) heading, wet grouting, timely water cut off." The water shortage in the field during heading and flowering period not only affects the pollen and stigma activity, but also leads to difficulty in heading, increases empty shell and reduces seed setting rate. Therefore, it is advisable to keep the water layer about 1 inch in the field. The grain filling period is the key period for the rice grains to accumulate dry matter and increase the grain weight. If the conditions of high temperature and drought are met, the duration of grain grouting will be shortened and the “high temperature force†will be formed. "Matured" phenomenon, resulting in increased pods and reduced grain weight. If irrigation is done for a long time, the vitality of the root system will be reduced, which will affect the absorption of water and nutrients by the rice plant. Therefore, this period should adopt moist irrigation, keep it dry, wet and wet, use it as the main water, irrigate shallow water for 1 to 2 days, dry naturally for 2 to 3 days, moist for 1 to 2 days, and then dry and wet alternating water method for irrigation of new water. , To achieve the purpose of adjusting fertilizer with water, adjusting water with water, increasing oxygen, keeping roots, and rooting with leaves.
Skillfully applying rice panicle and grain fertilizers:
Scientific application of panicle and grain fertilizers is a guarantee for rice to obtain high yield, high quality and high efficiency. According to tests, it is possible to increase the production of rice by 20% to 25%.
Rice panicle fertilizer refers to the period of young panicle differentiation before heading, and timely applying a certain amount of available nitrogen fertilizer will help consolidate the effective tillering in the early stage, reduce and prevent the degradation of spikelets, and promote good development of rice panicles. Due to differences in fertility, cultivated varieties, and meteorological conditions of paddy fields, the timing and methods of top-dressing are different.
Generally, the top dressing time is suitable for differentiation from branch to spikelet differentiation stage, about 16-18 days before heading, or rice leaf age index of 90%. The flag leaf of rice is just exposed and the spike length is 1 to 2 mm. The amount of topdressing fertilizer per acre is: if ammonium nitrate is used, 4 to 5 kg, if ammonium sulfate is used, 6 kg, if using ammonium diammonate, 4 to 5 kg is required. Before topdressing, irrigation 3 to 5 cm deep, plugging up and down the mouth, evenly spread, 4 to 5 days and then turn into a normal tube. In the case of rainy days, rice fields growing too busy may not chase panicles.
Rice grain fertilizer refers to a small amount of fertilizer that is applied 5 to 10 days after the ear, or a fertilizer that is applied two to three days before the heading of the rice cracks. Appropriate application, can make the grain full, 1000-grain weight increase; improper application, no effect or late-maturing lust, affect the yield.
In order to apply granulated fertilizer, we must do a "three look", that is, look at the sky, see the fields, and see the seedlings. To see the sky is to grasp the weather, when it is necessary to work in the drought, and to use less rain. Watching the field is to grasp the soil fertility of different plots, to make more thin fields, and to use less fertilizer. Look at the seedlings according to the seedling condition, the growth is thin and weak, the yellow color of the leaf color after heading is severe, the growth is strong, and the yellowing of the heading is lightly applied or not applied.
Granular fertilizer is generally applied ammonium sulfate, urea and other fertilizers, applied 3 to 5 kg per acre. At the time of application, the field should be filled with shallow water. Do not apply water after fertilization and allow it to dry naturally. If there is no urea, ammonium nitrate can also be applied. In addition to doing topdressing, it is also possible to use extra-foliage dressing. The methods are as follows: 1. Foliar spraying urea at a concentration of 1%, applying 5 kg per hectare; 2. Foliar application of potassium dihydrogen phosphate 0.5%, spraying 2.5 kg per hectare.
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