Method for cultivating conventional japonica rice blanket-shaped machine-transplanted tillered seedlings

Abstract

The invention discloses a method for cultivating conventional japonica rice blanket-shaped machine-transplanted tillered seedlings. The method specifically comprises the following steps of (1) expanding a rice seedling bed; (2) conducting chemical controlling before sowing; (3) conducting strict controlling over the sowing amount; (4) conducting early sowing, (5) applying seedbed fertilizer, (6) traying coverage, (7) water control, (8) conducting chemical control in the seedling stage, and (9) applying grafting fertilizer. Aiming at the technical defects of machine transplanting of densely-sown seedlings and the cultivation problem of the blanket-shaped machine-transplanted large seedlings, the the conventional japonica rice blanket-shaped mechanical-transplanted tillered large seedlings are cultivated by the measures of strictly controlling the seeding quantity, carrying out chemical control twice, regulating and controlling the seedbed fertilizer and nutrient supply through water andfertilizer coupling and the like by means of the method. The method has the advantages that (1) when transplanting is carried out, seedling blocks are tightly coiled, wherein 1480-1880 plants are coiled into one tray, the leaf age of main stems of the seedlings is 5.0-6.3, the height of the seedlings is 20-25 cm, 10%-20% of the plants have tillers, and the dry weight of one hundred plants of theparts above the ground is 5.0-7.0 g; (2) the utilization rates of seedbed fertilizer nitrogen and seeds reach 35% or above and 65% or above respectively; and (3) after planting, reviving and living are fast, and the field void rate is below 5.0%.

Description

technical field [0001] The invention relates to the technical field of seedling cultivation, in particular to a method for cultivating conventional japonica rice blanket-shaped machine-transplanted large seedlings with tillers. Background technique [0002] Seasonal contradictions of rice-wheat double-cropping system in northern Jiangsu are very prominent, effectively extending the growth period of any season can significantly increase the yield of the season. The traditional fertilizer bed dry seedling raising technology, due to the high fertility of the seedbed and low sowing density, the rice seedling age can be as long as 35 to 45 days. Heading, early maturity, and high yield of rice and wheat, but due to defects such as high labor intensity and low operating efficiency of manual planting, it cannot keep up with the needs of the current era. The machine-transplanted japonica rice blanket-like densely sown small seedlings machine-transplanted technology, which has been w...

AI Technical Summary

Problems solved by technology

The seedling raising technology invented by this piece has been applied to tens of thousands of acres in the northern Jiangsu area. It has outstanding advantages and disadvantages. The advantages are long seedling age, large leaf age, some seedlings with tillers, and high dry weight of the aboveground parts of hundreds of plants (3.5-5.0g). One is that the seedbed fertilizer application method is unscientific. The seedbed fertilizer is applied at the bottom first, and then the seedbed is made after shallow rotary tillage, resulting in serious fertilizer loss and extremely low nitrogen use efficiency (only 6.1-7.6%); the second disadvantage is that the sowing density is too high, resulting in In the late stage of the seedling field, the polarization of the seedlings is serious, and the seed utilization rate is low (only 40-44%), which leads to a high hole rate in the field after transplanting (8-15%); There are safety problems when urea is 20kg / mu