Insufficient density is a prominent problem in the current rapeseed production in our province, and is particularly concentrated on rice bran which accounted for 50% of the province's rapeseed area. Many rice bran rapeseeds have a transplanting density of only about 5000 plants per acre, or even lower. More than 2,000 to 8,000 plants per mu are required for high-yielding cultivation. The main reasons for this phenomenon are the delay in the maturation of rice in the previous crop, the tight season in agriculture, the labor shortage, and the drought-prone weather during the autumn season.
The theory of cultivation quality of rapeseed population considers that under medium-level soil fertility, the total number of stems per acre per mu of high-yield fields with a yield per mu of 250 kg or more is generally 180,000 to 200,000, of which the secondary branching accounts for about 50%. 7000-8000 strains per mu. The coastal drought-drown rapeseed planting area in our province has proposed “to expand the density, reasonable and sparse planting, and the suitable density is between 4,000 and 5,000 plants per acreâ€. It is also at this level of density, based on early harvest, high fertility, and ease of oil-cotton intercropping. Basically speaking. In fact, at present, the planting density of many rapeseed fields in the coastal areas is less than 4000 plants per acre, which is also insufficient compared to the local suitable density. In order to cope with extreme climate and strengthen self-resistance adjustment ability of rapeseed, we should emphasize rational close planting.
Practice has proved that the greatest impact on the yield of rapeseed is the number of effective pods per acre. Under the condition of generally low density, increasing the number of effective nodes per acre by increasing the number of plants per acre is effective. In 2010-2011, many high-yield demonstration farms in our province have increased planting density, which has played a significant role in improving the yield. In comparison, transplanting "one hole and two originals" is a feasible method to increase the planting density of rape. The results of the experiment in Xinghua City showed that under the same density conditions, the transplanting of “one hole with double originals†saved 20% of labor compared with conventional single transplanting, and there was no significant difference in real yield. The test results of Yizheng City also showed that under the same density level of 8,000 transplanted plants per acre, there was no significant difference in the theoretical yield of “one hole and double planting†and conventional single planting, but it was time-saving and labor-saving. Obvious simplification of cultivation advantages. The Yizheng and Xinghua tests also showed that the suitable density for transplanting "one hole and double originals" ranged from 7500 to 8500 plants per acre, and high yields were not easily obtained when the density was too high or too low. Baoying, Xinghua and other cities and counties adopted the “one hole and double original†transplanting method, which effectively increased the planting density of rape, and the total number of effective knots per acre increased.
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