The characteristics and precautions of rice non-woven dry seedlings

Rice seedlings are usually covered with agricultural film (plastic film) for thermal insulation, which has good thermal insulation performance, but the temperature of the seedbed rises quickly, and the temperature difference between day and night is large. Frequent ventilation is required to refine the seedlings, which is time-consuming and labor-intensive. Or the phenomenon of excessive growth, even the phenomenon of high-temperature roasting of seedlings, poor quality of seedlings, and serious seedling diseases such as withered and withered. Therefore, many regions have begun to explore the use of non-woven fabrics to raise rice seedlings, which can effectively provide better light, temperature, humidity and other environmental conditions for the growth of rice seedlings, so as to achieve the goal of full seedlings and strong seedlings. Let's talk about the characteristics and precautions of non-woven rice dry seedlings for reference.


The characteristics of rice seedlings using non-woven fabrics


1. Both heat preservation and ventilation, the temperature change of the seedling body is gentle, and the seedling is strong, which is manifested in many roots, thick stems, and the plants are not high.


2. It saves labor and time, and non-woven flat-laying seedlings reduces watering, ventilation and smelting operations. Due to the permeability of the non-woven fabric, the temperature buffer is stable, and the temperature in the bed is uniform.


3. Mitigation of pests and diseases, especially pests, can reduce environmental pollution caused by pesticides.


4. Low cost of use and convenient recycling. The non-woven fabric can be used continuously for 2-3 times, reducing the pollution of agricultural film to the environment.


5. Non-woven fabrics have a high seedling rate, a short slow-down period after transplanting to the field, and a high tiller rate and ear-forming rate, which is conducive to high yield.


Technical points of non-woven rice seedling cultivation in dry land


1. The choice of non-woven fabrics for rice


When selecting non-woven fabrics for rice seedlings, we must pay attention to the selection of non-woven fabrics for rice with a width of ≥ 2.1 meters and anti-aging treatment of filament non-woven fabrics. The dosage is generally calculated by length, which should be 1 meter longer than the seedbed. Never equate general industrial non-woven fabrics with special non-woven fabrics for rice seedlings. Industrial non-woven fabrics are thin, have poor tensile strength, are exposed to farmland environments, and often break and cause seedling diseases and deaths. occur.


2. Cover non-woven fabric


The use of non-woven rice dry seedlings has no difference with rice dry seedlings in terms of seed treatment, site selection, seedbed disinfection and acid adjustment, sowing amount and sowing methods. The main reason is that the agricultural film mulch is changed to non-woven after sowing. Cloth covering, and the way of covering film is different in each area.


If the seeds are planted in early April in Tianjin area, because the temperature is low, double film coverage is needed. First cover with a layer of plastic film and then add a layer of non-woven fabric. The specific method is to spread the plastic film on the seedling tray, both front and rear ends The soil is compacted, the left and right sides are not pressed, the top is covered with non-woven fabric, and the surrounding is compacted with soil; when the temperature is high, the non-woven fabric is used for flat covering or supporting arch covering.


In some areas of Liaoning, a layer of ultra-thin mulch film of the same width as the bed surface and slightly longer than the bed length will be placed on the bed surface to increase temperature and moisture retention, promote early emergence, quicker emergence, and increase the emergence rate. In some areas of Jiangsu, non-woven fabrics are usually covered with mulch for heat preservation when the temperature is low. No matter what kind of mulch or plastic film is used for heat preservation, the film must be removed immediately after the seedlings emerge.


Precautions for using non-woven dry seedlings


1. Use non-woven fabric to raise seedlings in spring. Due to the low temperature, you should add mulch or cover the mulch and then add a layer of non-woven fabric to keep warm. At 1 heart, the membrane can be withdrawn.


2. The non-woven cover has good permeability, pay attention to water replenishment, generally water once 7-10 days after falling, and keep half-ditch water afterwards, so that no water can accumulate on the board surface. The cover should not be too tight, otherwise the growth of the seedlings will be affected if the seedlings become bigger in days.


3. Non-woven fabric covering on the one hand can reduce the occurrence of seedling diseases, and on the other hand, hinder the damage of insect pests, but can not prevent the occurrence of diseases and insect pests. Pay attention to more observations in the field to prevent and cure diseases in time.


4. Before transplanting, uncover the cloth in time, or uncover the cloth in time from 3 leaves, 1 core to 4 leaves, and topdressing according to the leaf color of the seedlings after uncovering the cloth.