The cultivation of rapeseed direct seeding can simplify the production of rapeseed, and is suitable for rice rinsing and early drought irrigation in the whole province before mid-October. It is in line with the production development trend to promote live rapeseed according to local conditions. However, rice harvesting in our province has become more and more late in recent years, and it is not possible to guarantee the timely sowing of live rapeseed, limiting the development of live rapeseed. In particular, last year, the rice harvest in our province was quite late. It also directly led to a sharp drop in the area of ​​live rapeseed sown in autumn 2009, which fell from 1.44 million acres in autumn 2008 to 1.29 million mu, a decrease of 10.4%, and the rape area in the same year. The overall decline is only 3.4%.
“The glutinous rice glutinous rice cultivars are generally late and late, and this is the first issue facing the production of wheat and rapeseed in our province. If oyster sauce is too late, the risk of live rape will increase. This is the main reason for the decline of the area of ​​live rapeseeds in our province last year. According to Wang Longjun, deputy director of the Provincial Planting Station and deputy director of the Provincial Committee of Rape, the suitable planting period for live rapeseeds in southern Jiangsu is from the end of September to October 25, and that of Central Jiangsu is from late September to October 20. Seeding early in the appropriate sowing period and growing strong seedlings will help increase the level of production. Late rape, which was broadcast during the appropriate sowing period, had a small growth before winter, increased risk of freezing injury and dead seedlings, and had a greater impact on yield. All localities should use rapeseed sowing methods according to local conditions according to the harvest time of the former crops, and it is not appropriate to broadcast rapeseed too late. In addition, the cultivation of live rapeseed in the northern part of our province is at great risk. It is not suitable for the live rapeseed of rice bran in the areas north of Jianhu, Baoying and Yixian.
It is understood that since the beginning of July, the average temperature of the province has been higher than normal, the light is sufficient, the growth process of rice has been accelerated, and the transformation of the seedlings has been promoted. The current cropping period is generally delayed by 5-7 days compared with last year. The province’s rice production process is similar to last year, but it is still late compared to the previous year. In late August, our province suddenly encountered continuous low temperature and rainy weather, which was unfavorable to rice growth. Overall, the rice harvest this year may be close to last year and later than later. Every year. In addition, Jiao Meiyan, deputy director of the China Meteorological Administration, also said in an exclusive media interview that there is a possibility of low temperature this winter. Therefore, it is expected that the amount of meat that is suitable for direct seeding rape this year is still relatively small, and it is more likely that the live broadcast will be subject to freezing injury. For some plots that are lagging behind, it is best to plant rapeseed in advance to prepare seedlings for transplanting, so as to avoid planting oilseed rape without seedlings.
In addition to the appropriate sowing, the live rapeseed should also be fine sowing, broadcast all seedlings. Generally, the sowing amount per acre is 0.3-0.4 kg. Early sowing and high-fertilizer fields are suitable for reducing the sowing amount. For the more weedy plots, glyphosate was used to kill the grubs before sowing, and normal plots were treated with acetochlor for 2 days after sowing. In the rape growing season, the grass weeds were controlled by high-efficiency flupirtine in the 3 to 4 leaf stage of the weeds, and the broad-leaved weeds were removed or removed manually after the 6-leaf period of rapeseeds. After the emergence of rapeseed, early seedlings, the main removal of seedlings as well as small, weak seedlings, and at the same time check whether there is no broken ridge phenomenon, as soon as possible evacuation. Before and after the 3rd leaf stage, seedlings were planted according to the growing conditions of the field and the fertilization level, and the density was controlled at 20,000 to 30,000 plants per mu. Before wintering (from mid-late November to early December), use 15% paclobutrazol per acre to spray 40-50 kilograms of water from 40 to 50 grams, and control it 1 or 2 times. Scientific fertilization, NPK combined application. On the basis of re-using basal fertilizer, see Miao chase seedlings. The total nitrogen application rate is 16 to 18 kg per mu, and the nitrogen fertilizer operation is carried out according to basic fertilizer, Miao Fei, and Feifei 5:2:3.