High Yield Cultivation Techniques of Hybrid Rice

The hybrid rice cultivation techniques, which are some different from the local inbred rice varieties (OP), are as follows:

1. Carefully preparing the adequate seedbed. Before sowing 5-7days, plow the dry bed then irrigate and covered it with water. If the fore crop of the seedling bed is green-manure, it should be plowed and leveled 7 days before sowing. Then with deeper water soak the bed. Before sowing, apply adequate fertilizer and plough and level the bed again. The amount of the fertilizer is more 20-30% than that of the non-hybrid rice varieties (adjusts the ratio of the chemical fertilizer and farm manure based on the soil¡¯s conditions). Divided plots and ditch of the bed. The width of the plot is 2m and the ditch¡¯s is 30cm, the depth of the ditch is 15 cm. The ratio of the seedling bed to the paddy field is 1:4.

2.Control the sowing density, and pay attention to thin and even broadcast to grow strong seedling with tillers. Sowing time should be suitable for the local condition of air-temperature and other climatic ones. The seeding rate of a seedling bed is 10-15Kg/1000m², and that of the field is 2.25Kg/1000m². After seeding, basically keep the seedling bed moist. The water regime is ¡°Full water of ditch under sunny day, half-full water of ditch under cloudy day, no water of ditch under rainy day, flowing water of ditch under burning sunny day¡±. It should be submerging the seedling during the disaster weather to protect it. When the temperature is higher, it is suitable to flow water in evening, but in the noon of the next day keep the bed-surface no water to prevent seedling from scald. From 1 leaf to 3 leaves stage, it takes the way of combination no water with thin water level on the seedbed. After 3 leaves stage, it should keep continuously lower level all the time and prevent no water on the bed. Based on the condition of the fertility of the bed, need to apply fertilizers respectively on the stage of 1 leave with 1 sheet and 3 days before transplanting (the main fertilizer is N and rate is 4.5-7.5Kg/1000m² each time). The seedling age is 30-35 days; before transplanting, single basic seedling should have 8.5-9.0 leaves and 5-6 tillers.

3.Rational planting density. Transplanting adequate basic seedling to build high yield framework. The paddy field preparation should combine with herbicide applying. Applying adequate basic manure (the fertilizer application in the whole growing period is 25-40% more than no-hybrid varieties). It is about 70% fertilizer of the total amount applied before transplanting (farm manure combined with N. P. K compound fertilizer). Generally, all P and K are applied in one time. Transplant basic seedlings with tillers and root-soil, fertilizer and pesticide. It is in same day from seedling bed to field. Transplanting seedlings should be shallow, uniform, straight, and no floating¡±. The planting density is 13.0cm¡Á23.3cm or 13.3cm¡Á26.7cm. 2 basic seedlings with tillers per bunch. Adequate 27000-30000 bunch per 1000m². The rational planting density is the basis for acquiring the high yield of hybrid rice.

4.Timely dressing to promote the framework of high yield. During plants reviving stage, add 30% of the total amount of N-fertilizer after 7 days of transplanting. During ear initiation stage, add 50% N-fertilizer of the total for 1-2 times. At the full heading time, add the last 20% N to promote the rate of grain-bearing and 1000-grain weight. Meanwhile, if the soil lacks P or K, need spraying foliage top-dressing.

5.Drying the paddy field under sunny days after getting adequate plants and weeding in time. Draining field after it gets 360,000-400,000 effective tillers per 1000m². The standard of drying the soil is ¡°Deeper split on the sides of field, less deep split in the middle of field, the soil can be stood by feet and the leaves are getting yellow and straight¡±. Then irrigate the field again, and keep lower water in the field, attention is paid to weeding and, improve circumstances for rice plants growing.

6.Strength water regulation from initial heading to full heading stage. Keeping 10cm water in the paddy field is beneficial to floret initiation and improving the rate of grain bearing. During milk ripe stage, pay attention to irrigation and non-irrigation by turns to keep the soil moist. It will help to increase 1000-grain weight.

7.Take notice of the field pest and disease preventing and controlling to lower damages by diseases and pests.

Remarks: hybrid rice need at least 30% more dosage of fertilizer than OP, especially potassium fertilizer should be adequate.