Many peasant friends ask how the rice delivery is too small. How can I tell if I can continue to give birth? Fertilizer way to pay attention to what? ...... Due to this year's low temperatures and rainy weather, changing temperatures, and large temperature differences, and other special climatic conditions have caused a general delay in the growing period of rice, slow growth, fewer tillers, or the phenomenon of non-delivery, resulting in a very serious field management of rice. With great difficulties, we combine the above issues to analyze the specific situation. This year's rice can really use only 3 to 5 births for the following reasons. 1, poor quality of low temperature seedlings This led to a delay in returning green, causing a large slow seedling. The first 4-5 leaf nutrient is only enough for the supply of green, and the effective tillering starts from the sixth leaf according to the n-3 law. The upper third crop of the rice begins to occur, and the eighth leaf ends, and 6 tillers can be used for actual production. Only 3-5 of them are affected by low temperatures. 2. The spread of planting density is large The density of transplanting of farmers' friends is generally about 7-8, and a few are about 10. The direction of rice tiller is very important for determining the number of trees per hole when transplanting rice. If inserting a single plant, the direction of tillering is 360 degrees, and the two trees are 180 sides, three trees are 120 angles, and four trees are 90 angles. There is no space for 90+0 trees. The concept of 90+0 is that the four branches of the five seedlings are each 90, and the other seedling is coming in the middle. There is no direction of delivery. From this point of view, the number of seedlings per hole should be 4-5. The strain is easy, the seedling maintenance rate is 4 and it is not easy to be too much. Many affect delivery. What is the standard for the number of births and enough? The panicle population is the number of rice panicles per unit area after the heading of rice (generally less than 5 grains per spike). It can also be understood as the number of effective stems. The more effective the number of stems, the more ear heads, the higher the yield. After reaching a certain value, the ear head no longer increases. After a certain value is exceeded, the maturity level decreases and the yield decreases. For our mid-season cultivars in Heilongjiang, the panicle population is generally 500-550 per square meter, the large ear variety is 450-500 per square meter, and the spikelet variety is 550-600 per square meter. Only the number of effective stems can be guaranteed. Spike, ensure spike groups, ensure yield. How to determine if the number of effective stems is up to standard? 1. Multi-measurement test: For each hectare, three kinds of performance plots: good, medium, and poor should be selected as the selected points. 2, average sampling, each point to take observation points 10 points. 3, comprehensive evaluation, the total number of stems 30 points together, calculate the average number of stems 30 points, multiplied by the number of holes per square meter counts hectares. Calculated on a square meter basis, such as normal management if it reaches 80% of the target stem number per square meter. If not, follow the following management measures. 1. Water management: intermittent irrigation is not recommended. Appropriate airing of fields, oxygen transfer to the soil, removal of harmful substances, so that the roots under the bar, strong roots and strong stalks. 2, disease prevention and weeding: more weeds in the field, it is recommended to adopt stem and leaf treatment methods, broadleaf weeds to Bendarson-based. Rice bran can be controlled by cyanopoxamate. At the same time, it is prone to prophylaxis in this period of time, which is prone to bacterial blight, bacterial brown spot and sheath blight. 3. Increased leaf production: At this time, the leaf area index should be increased to ensure effective leaf number, and the last 4 leaves should be protected. The number of tillers is guaranteed to have more than 3 leaves. By increasing the overall photosynthetic efficiency, the carbohydrates in the later period can be increased. accumulation. With the management of the water layer, we can achieve the effect of increasing the production of leaves with root protection. It is also possible to spray foliar fertilizers as appropriate to increase the long-term tiller leaf area. 4. Qiao Shi Pan Fei: In the inverted 2-leaf stage, the leaf color is not faded, and the seedling application can be seen when the flag leaf is exposed. The amount of panicle fertilizer should be 20% of the total fertilizer for the whole growth period of nitrogen fertilizer, and potassium fertilizer should be 30~40% of the total growth period. 11 leaf cultivars ranged from 9.1 to 9.5 leaf stage, and 12 leaf cultivars ranged from 10.1 to 10.5 leaf stage, which were applied during this period to achieve high yield.
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What should I do if the rice delivery is not enough?