I. Fertility characteristics of dry seedlings Due to the influence of water control on seedbeds, the dry leaf speed is slow at the Seedling stage, but after being thrown into Honda, it is stimulated by water and fertilizer. The leaf emergence speed is significantly faster than that of water seedlings, and the total stem number of the main stem at the heading stage is reached. Both are similar to the water eel. Therefore, the growing period of the dry and eel throwing was not changed, but the proportion of leaves emerging during the Honda period increased. Agrostis Stolonifera,Astragalus Sinicus,Vicia Villosa,Agropyron Cristatum Chengdu Lv Mu Tian Xia Agricultural Technology Co. LTD , http://www.cdlmtx.com
In the paddy field, after the three-leaf stage, the growth was significantly inhibited as the soil moisture content decreased, and the leaf emergence rate was 20-30% slower than that of the leeches. However, the leaf-to-blade coexistence rate was high, and the cockroach emergence rate was generally over 10%. However, there was no occurrence of leeches; the incidence of one-time delivery at low-margins of droughts and floods was generally about 70%, while that of leeches was generally below 40%. At the same time, as a result of water control, the upper part of the leaves of the drought-swamped land becomes shorter, the seedlings are lighter, and the quality of the underground part is relatively increased, which is conducive to throwing up seedlings. Droughts and leaves were thick and strong, nitrogen and carbon ratios were coordinated, and the ability to plant wounds after throwing was strong. The underground part of the underground system is well-developed, widely distributed, and strong in vitality. However, the thin and fragile roots not only make it easier for roots to emerge, but also do not cause the phenomenon of root colonization, which is conducive to even spreading. Therefore, dry seedlings are an ideal way to throw seedlings.
In the field period, due to the dry and embarrassing pods, there are more mother stems after transplanting; the drought-logging seedling age is relatively small, and after transplanting, the planting injury is basically not occurred, which is conducive to the increase of the number of effective tillers in the field. With the extension of the effective delivery period, the number of childbirths in two deliveries increased significantly, the number of invalid deliveries was relatively small, and the rate of spike formation was light and high.
Judging from the structure of the population, there are obvious advantages in the early birth of individuals. At the same density, the single planting of dry seedlings was 20-30% more than conventional hand planting, and the number of panicles was more than 30% higher. At the same time, due to the high number of single plants per plant, the distribution of heading layers was relatively dispersed and the top panicle accounted for 69.1%. On the other hand, 82.2% of the top panicles of the hand-planted pods were of poor quality due to poor ventilation and light transmission. The distribution of leaf layers of the seedlings in the dry-earning plot also has the same trend as that of the spike layer distribution. As the coverage of the upper layer is reduced, the ventilation and light transmission conditions in the lower part of the crown are improved, and the quality of the middle layer of about 30% is greatly improved. The results not only improve the utilization of light energy of the population, but also increase the thickness of the effective ear layer and increase the total storage capacity of the population.
Second, cultivation points
1. Fertilizing the fertile bed The fertile seedbed is the foundation for good drought and drought. To select high-lying, well-drained drylands, concentrate Dianchi Lake and fertilize for a long period of time. Basal fertilizer should be applied early, adequately, mainly organic fertilizer, with the application of phosphorus and potassium fertilizers.
2. Suitable for general sowing in the initial seeding amount of 15 to 20 kilograms per mu, conventional rice 40 to 50 kilograms per mu. In order to prevent the death of young plants and ageing, the sowing date should not be too early.
3. Strictly control watering The seedlings must be strictly controlled after the 3 leaf stage, and only when the seedlings appear curled leaves can they be watered in the evening. And to prevent the accumulation of water in rainy days, this is the key to ensuring the physiological advantages of drought and flood.
4. Accurate mastering of planting density According to the practical experience of paddy planting in paddy field, the ideal density is 1.8 to 20,000 holes per acre or 50,000 to 60,000 in the beginning of hybridization; Million stem seedlings. The number of seedlings in a given seedbed area can be sampled before the dumplings are thrown in, and then the required seedbed area per mu per mu can be calculated based on the number of seedlings required per acre of field. As long as the seedlings of the seedbed area are adequately thrown, the number of basic seedlings in the field will be guaranteed.
5. Daejeon Management's technical strategy for field management is to “prepare for stability in the early stage, attack the big spike in the middle period, and strive for efficiency in the later periodâ€. Fertilizer management focuses on reducing the amount of nitrogen fertilizer on the whole, using 70% of nitrogen fertilizer and organic fertilizer, phosphorus and potassium fertilizer as base fertilizer, and using 10% of nitrogen fertilizer as panicle fertilizer. Avoid excessive nitrogen fertilizer in the later period, resulting in lodging of Love Green. Water slurry management emphasizes shallow wet irrigation and promotes vertical root development. Ensuring that the field is put in advance on a timely basis on the basis of sufficient seedlings for effective tillering, depending on the development of the seedlings, from light to heavy. During the grain filling and maturation period, we must strictly maintain the wetness of the field hard plate to prevent lodging.
Third, the existing problems and countermeasures
1. When throwing seedlings, seedlings with small soil and easy scattered seedlings with less soil and scattered, not only is not conducive to casting, but also difficult to establish seedlings. Therefore, the seedbed should be selected for more viscous fertile soil. In sandy loam, a layer of 1 to 3 cm thick sticky pond mud is used for breeding. At the same time, the soil moisture must be mastered when starting up.
2. Inseparable seedlings, a few days before throwing seedlings to control the seedbed moisture, should not be watered again, let it dry naturally, so that the surface layer of soil is not hard to paste, the humidity to hand pinch mud is not scattered, sticky hand is appropriate . Every 4 to 5 strains in the beginning of the regular season are 1 (points), and 1 in the beginning of the hybridization (holes). When throwing each time to 3 ~ 5 (holes) is appropriate, can not throw too much.
3. After throwing, it is difficult to stand seedlings 1 to control water seedling height, after 3 leaves, no rolling leaves, no watering, 2 controllable catching dwarf, soaking seeds with a concentration of 150 mg/kg uniconazole, or 15% paclobutrazol 300 mg/kg The concentration of the seedlings in the seedlings 1 leaf heart and 3 leaf heart each spray 1 field 8 to be flattened, field surface should be clean without weeds. It is necessary to intensively cultivate the surface to make it puddle. The surface of the field requires a water-free layer during casting. After throwing, the ditch begins to go missing.
Author: Jiangsu Hujian Agricultural Technology Station, Jianhu County, Jiangsu Province