If you want high yield of rice, you should know the techniques of cultivating strong seedlings.

Rice is not only a kind of herbaceous rice, but also the most important and oldest kind of grain in rice. It is also a staple food for people in the south of our country. High yield of rice is very important for growers, so the following techniques of cultivating strong seedlings must be known!

I. seed treatment

1. Seed drying: choose sunny weather before seed soaking, put it in the leeward and sunny place, every day from 8: 00 a.m. to 3: 00 p.m., continuously drying seeds for 2 Mel for 3 days.

2. Seed selection: air separation and solution selection. Wind selection: blow with a dustpan or windmill to select empty shells, grass seeds, grass leaves and other sundries; solution selection: there are water separation, mud water separation, brine selection, etc., and the seeds should be cleaned after selection.

3. Seed disinfection: in order to kill the germs and dry-tip nematodes attached to the seeds, the seeds must be sterilized before sowing, and the seeds are soaked with 2000 times of chlorphenil for 72 hours.

Second, make a bed by preparing the ground.

Green food rice seedlings are uniformly raised by drought, and the ratio of seedling field to field is about 1:13.

1. Seedling field selection: dry or garden fields with leeward and sunny, flat terrain, fertile soil, convenient irrigation and drainage, and good permeability paddy fields can also be selected to raise seedlings.

2. Soil preparation: after the beginning of spring, after shallow turning and rotary tillage, remove the stubble and level it.

3. Make the bed: the width of the bed is 1.8m, the length of the bed is 10-15m, and the trail groove 40cm. After making the bed according to the specification, flatten the bed surface repeatedly.

4. Preparation of nutritious soil:

Nutritious soil should be prepared according to the degree of soil fertility. In general, 60% fertile soil (garden soil) and 40% fully mature high-quality farm manure are fully mixed and sifted and mixed evenly.

5. Sowing seeds

Before sowing: in the case of plastic film insulation, when the temperature is stable through 10 ℃, sowing and raising seedlings in time, it is appropriate to sow seeds from March 15th to 25th.

6. Seedling field management

(1) temperature management: heat preservation is the main method before the needle stand, and about 30 ℃ in the film is kept to promote seedling emergence. When the seedling grows to 1.5 ℃ 2-leaf stage, attention should be paid to cooling and refining the seedling. The temperature in the film should be controlled at about 25 ℃. When the temperature exceeds 25 ℃, both ends of the seedling should be ventilated and cooled. When the seedling grows to the three-leaf stage, cover the seedlings during the day and night when the weather is fine, and the temperature is stable at 10 ℃, the film can be removed to cultivate ideal strong seedlings.

(2) Water management: on the basis of sufficient bottom water during sowing, there is generally no need to water before emergence. If insufficient water is found and the bed surface becomes dry and white, it should be watered in time. When the seedling is green, it should be watered once, 1 leaf and 1 heart, combined with ventilation and seedling watering, watering later as appropriate, replenishing water in time when the film is removed, and squatting seedlings in the sun bed 57 days before transplanting.

(3) Fertilizer management: generally, no fertilization is needed at seedling stage, but fertilization can be applied according to the growth situation after 3-leaf stage, and potassium dihydrogen diphosphate is sprayed once. If fertilization is needed, 5 kg urea per mu can be properly applied 10 days before transplanting, to increase the cold resistance of seedlings and accelerate the return to green to promote early tillering.

(4) Weed control in seedbed: artificial weeding is the main method, and the use of herbicides with high efficiency, high toxicity and high residue is strictly prohibited. The weeds in the field were pulled out manually before transplanting.