Late japonica rice "Zhejing 30"

I. brief introduction of varieties

"Zhejing 30" was bred by the Institute of crop and Nuclear Technology Utilization of Zhejiang Academy of Agricultural Sciences in the spring of 1995 with Xiushui 63 as female parent and R9475. After years of breeding, it was bred by the selection of appearance quality (grain shape, transparency, chalkiness, chalkiness rate) of low generation, resistance identification of disease area, amylose content of higher generation and other physical and chemical quality determination, taste taste and resistance identification. It has participated in all levels of trials since 1999 and was approved by Zhejiang Variety approval Committee in March 2003.

Zhejing 30 is a dense panicle variety with compact plant type and strong tillering ability. the whole growth period is 134.5 days, effective panicle per mu is 233000, full grain per panicle is 82, seed setting rate is 91.6%, and 1000-grain weight is 25.7g. According to the results identified by the Institute of Plant Protection, Zhejiang Academy of Agricultural Sciences, the average grades of leaf blast and ear blast were 2.7 and 2.0 respectively, while those of the control variety Xiushui 63 were 7.0 and 3.0 respectively) showed resistance to rice blast and moderate resistance to bacterial blight. Susceptible to fine stripe, brown planthopper and white-backed planthopper. According to the regional trial of late rice in Zhejiang Province from 2000 to 2001, the average yield per mu was 5.46% higher than that of the control variety Xiushui 63 (reached a very significant level). In 2002, Xiaonan District, Xiaogan City, Hubei Province tried to plant 20.6mu, and the average yield per mu set a record of 805.3 kg. It is considered to be a new super-high-yield and high-quality japonica rice variety. Through the trial planting experiments in Zhejiang and Jiangsu provinces, they all showed good adaptability, with a total planting of 1.4466 million mu (1.3846 million mu in Zhejiang Province and 62000 mu in Jiangsu Province).

According to the analysis of the quality Supervision and Inspection Center of Rice and products of the Ministry of Agriculture in 2000 Zhejiang Jing30 (regional variety name: ZH992) brown rice rate (84.3%), milled rice rate (76.1%), head rice rate (73.0%), grain length (5.2mm), ratio of length to width (1.8), alkali elimination value (grade 7), gel consistency (78mm), chalkiness rate (4.3%), chalkiness (3.3%), amylose content (15.7%), transparency (grade 1) The above indicators all meet the first-class standard of "High quality Edible Rice" issued by the Ministry (NY20-1986). Compared with Xiushui 63, Zhe Jing 30 had 1.2% higher brown rice rate, 4.0% higher milled rice rate and 3.0% higher head rice rate. In other words, compared with Xiushui 63, Zhejiang Jingjing 30 increased rice yield by 5.46% and rice yield by 4.0%.

Because Zhejing 30 has excellent rice quality, high yield, strong resistance and good adaptability, it is suitable for planting in the whole province of Zhejiang and the middle and lower reaches of the Yangtze River. The novelty search of Zhejiang Institute of Science and Technology Information showed that the comprehensive characters of rice quality, yield and resistance of "Zhejiang Jingjing 30" were the best among the same types of varieties. Since the trial planting in Zhejiang in 2000, the planting area has expanded year by year, and now it has developed to more than 600,000 mu a year, and gradually developed to the surrounding provinces (cities), which has an excellent prospect of popularization and application. After being approved by the Variety approval Committee of Zhejiang Province in 2003, the popularization and application of this variety in the above-mentioned areas was accelerated. It is predicted that the suitable sowing area of Zhejiang Jingjing 30 is about 20 million mu. If the variety accounts for 10%, the annual extension area is expected to reach 2 million mu. According to the cumulative extension of 4 million mu in two years, the yield is increased by 20 kg per mu, and the income can be increased by 80 million yuan per kilogram of rice. Because the rice yield can be increased by 4.0% compared with the control varieties, the rice yield can be increased by 72 million kg per mu and 4 million mu, and the income can be increased by 129 million yuan (rice: 1.80 yuan / kg). Taken together, the two items can produce social and economic benefits of 209 million yuan.

II. Cultivation regulations

1. Seed disinfection: soak the seeds with seed disinfectants such as "402" or "soaking seed Ling" to make the seeds enter the soil without disease.

two。 Sowing seeds in accordance with local conditions: June 20-25 is suitable for the north of Qiantang River in our province, and sowing can be postponed appropriately in the south of Qiantang River.

3. Pay attention to controlling the amount of seed used: Zhejiang Jingjing 30 has strong tillering ability, so the sowing rate of seedling field is not more than 30kg per mu, sparsely sowing strong seedlings, cultivating tillering seedlings, and the seedling age is not more than 30 days. The amount of seed used in the field for double-cropping rice is generally 3.5kg, and that for single-cropping rice is 2.5kg per mu. If the amount of seed is too large, it is easy to cause lodging, which affects not only the yield but also the quality of rice. Reasonable close planting, continuous and late cultivation, generally planting 30, 000 clumps per mu, 4 clumps per clump, and 25000 clumps per mu, 3 clumps per clump.

4. Scientific use of fertilizer: experiments show that excessive application of chemical fertilizer will reduce the quality of rice. The use of fertilizer should be mainly organic fertilizer and biological fertilizer, less inorganic fertilizer, and properly increase the application of P and K fertilizer, so as to reduce the chalkiness of rice and improve the processing quality. The total amount of fertilizer per mu is 50 piculs of standard fertilizer for continuous cropping and 55 piculs of standard fertilizer for single cropping rice, and it needs to be applied early. Post-fertilizer must not be too late and overweight, otherwise it is easy to cause lodging and decline the quality of rice.

5. Pay attention to water slurry management and pest control: Rice panicles formed by high tillers are easy to produce semi-solid grains or green grains, affecting rice quality. Therefore, the water slurry management in the early growth stage should be dry, dry and wet, promote low-node tillering and reduce the number of high tillers. Zhejing 30 is a dense panicle type. In some years, it is easy to be infected with rice false smut and affect its yield and quality. it is sprayed with 100 grams of Qianqu Kexing powder and 40 kilograms of water per mu and sprayed for 7 days before heading.

6. To grasp the suitable harvest time: Zhejiang Jingjing 30 is dense panicle type, and the grain filling at the base of panicle is slow. The maturity of this part of the grain largely determines the chalkiness rate and chalkiness index of rice. The harvest time after maturity has little effect on the economic yield, but has a great effect on the quality of rice. Appropriate delay in harvest can reduce the ratio of green rice, improve rice quality and improve the palatability of rice.