The low density of rapeseed transplants is a major limiting factor in the production of large areas of rapeseed production. Experts believe that under the same density, two workers in one hole planted obviously, but the output is not much difference; in the same working hours, the use of one-hole and double-plant can effectively increase the rapeseed density and increase the yield.
Rapeseed cultivation experts and Professor Yangsuo Hu from the Agricultural College of Yangzhou University studied the relationship between planting density and yield of rape under different yield levels. As the density increased, the yield of rapeseed increased first and then decreased. According to calculations, the highest density is when the transplanting density is 7,850 plants per acre, and the yield within the range of 7200-8500 plants per acre is less than 1% within the maximum yield. Under the current production level, the suitable density range for high-yield cultivation of rapeseed is 7200-8500 strains per mu and the yield per mu can reach 270 kg. Density below 6500 plants per acre or more than 9300 plants yields more than 5% of the maximum yield. If the density is less than 5000 plants per acre, the yield is more than 20% lower than the maximum yield. Therefore, the production cannot be over-emphasised on labor saving and the planting density of rapeseed is too small. Under the premise of ensuring the density, transplanting with one planting in two plants is an effective method for laborers.
In the autumn of 2009, Wang Jie, a planting station of Xinghua City, conducted a planting experiment on different methods of planting rape seedlings in the autumn of 2009. The test site was in the Zhu Defang Responsibility Field in the Xiashe Responsibility Area of ​​Lianxi Village, Shagou Town, Xinghua City, and the variety was Qinyou 7 No., seedlings were planted on September 27 and transplanted on November 4-5. The area of ​​the plot is 14.95 square meters (33 meters in width and 4.53 meters in length). There are 192 trees in each plot, equivalent to about 8,500 transplants per acre. Repeat 3 times for each treatment. The statistics of the time used for each transplanting process show that the average time per cell is 24 minutes and 59 seconds for a single avenge and 39 minutes and 57 seconds per cell for a single plant transplant method. The single plant transplant method is more versatile than the single axillary double plant method. Working hours 59.9%. During the early winter and rapeseed stage, the seedling quality of rapeseeds was investigated. There was no significant difference in the growth of rape planted in these two ways. The results of the yield survey carried out during the rapeseed maturation period show that there is little difference between the yield structure and yield levels of the two crops. One-hole and double-planting methods are equivalent to the theoretical yield of 293.29 kg per mu and the actual harvested per mu is 233 kg; the single-plant transplanting method is equivalent to 282.81 kg of theoretical mu, and the actual harvest is 235 kg per mu.
In the production, the transplanting density of rapeseed is raised to about 7200 plants per acre for high-yield cultivation, and only about 15.6 hours for transplanting with one-hole double planting, which is more than the production of large-area low-density plants transferred (5000 plants required
17.3 hours) Labor must be saved, and the effect of increasing production density is obvious.
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