Key points of strong Rice Seedling planted by disk cultivation Machine

Economic Daily News: plate cultivation machine transplanting small and strong rice seedlings is an important link to achieve high quality and high yield of mechanically planted rice. The specific technical points are as follows:

Soil preparation

Select the loam with fertile soil, no stubble, gravel, weeds and no pollution to seedlings, PH 4.5-5.5. If there is no such acidic soil, sulfuric acid and nitro humic acid can be used to adjust acid. In order to prevent the occurrence of seedling diseases such as blight, 50-60 grams of dimethazone were applied per cubic meter of pan soil. Fertilize the pan soil, add 200-400 grams of pure nitrogen, pure phosphorus and pure potassium per cubic meter, fully mix and air, so that it is easy to sift with a sieve with a pore diameter of 4-6 mm. 20 cubic meters of dry and fine nutritious soil are required for each mu of clean seedling pond.

Seed treatment

Varieties with high purity, removal of millet branches, germination rate of more than 90%, strong germination potential, spike and heavy grain should be selected. Early maturing medium japonica or medium indica should be selected for wheat stubble rice. Sunny days for 2-3 days, the use of mud or salt water seed selection method to remove empty grained particles. Dilute 2000-3000 times with 25% Spock EC, soak the seeds for 48-60 hours, then rinse with clean water, sprout until the breast is white, and then sow the seeds.

Requirements of seedling bed

The seedling bed should be close to the field to facilitate the transport of seedlings and improve work efficiency. The ratio of net seedling to field is about 1 ∶ 160. The soil is fertile, the drainage and irrigation is convenient, and the height difference of the ground is no more than 3 cm. The width of the border is 1.4 meters, and the width of the furrow is 0.25-0.3 meters. It is appropriate for the softness and hardness not to sink the feet and not turn white. Two plates are arranged horizontally on each side and 1.2 meters wide, leaving 10 centimeters on each side of the border. When setting the plate, make sure that the seedling plate is flat and sticky with mud, and there is no gap between the seedling plates. The border is covered with plastic film.

Mechanical sowing

Mechanical sowing can be successful in sowing, spraying water, sowing and covering soil at one time, with high sowing efficiency and good sowing quality. Before sowing, the germinated seeds should be properly dried or placed in a gauze bag and swung in an electric dryer for 1-2 minutes. It is appropriate to sow seeds without sticking hands. Sowing plate soil bottom soil thickness of 2 cm, cover soil 0.5-1 cm, pan soil spray requirements for a wet state, each plate sowing bud valley about 0.2 kg, sowing evenly.

Seedling pond management

Keep the soil moist in front of 1 leaf and 1 heart, and the temperature is controlled at 30 ℃. At this time, if there are seedling leaves to lift the soil, you can use spray leaching. After 1.5 leaves, the daytime temperature is controlled at 20-25 ℃, the night temperature is controlled at about 15 ℃, and the ditch water should not exceed the disk surface. After 2.0 leaves, the bed temperature was gradually close to the natural temperature. Clear the border ditch water 2-3 days before transplanting to promote seedling rooting and facilitate seedling raising and machine transplanting.

Scientific fertilization

When the seedlings have one leaf and one heart, 0.5-1 g urea is applied on each plate (58 cm × 28 cm) and 1.2-1.5 g urea per plate 3-4 days before the seedlings leave the bed, which is beneficial to the normal growth and development of rice and facilitate the rapid return to green and living plants after machine planting.

Prevention of diseases and insects

While applying grafting fertilizer, 75 grams of 20% tricyclazole wettable powder per mu of seedling bed plus 100 mg of 50% methamidophos EC or 200 mg of 18% insecticidal double water agent were sprayed on 50 kg of water to prevent rice blast, rice thrips and other diseases and insects from being brought into the field.

Suitable time for machine insertion

When the seedling has 2.5-3.5 leaves and a height of 12-15 cm, it should be planted by machine. After more than 3.5 leaves, the quality of seedlings began to deteriorate, and the squatting period was long after planting, which was not conducive to early development.