Changnongjing 2 (Rice)

The new rice variety "Changnongjing 2" (formerly known as 89-94) is a new mid-maturing late japonica variety bred in 1993 by the Institute of Agricultural Sciences of Changshu City, Jiangsu Province, after the double crossing of 84G091/ Xiushui 04bat / Wuyujing 2 in 1989 and continuous non-greenhouse generation of F1 and F2. The strain has the characteristics of excellent rice quality, high yield, early maturity, good adaptability and so on.

The characteristic of this variety is large panicle, large grain, low sterility rate and high 1000-grain weight. It belongs to large panicle type, similar to hybrid japonica rice. Generally, the yield per mu is more than 650kg, the number of ears per mu is 198500, the total grain per panicle is 133.4, the sterility rate is 10%, and the 1000-grain weight is 29g. When the yield level was further increased, the number of panicles decreased and the panicle type increased. Determined in 1998 by the Rice and products quality Supervision, Inspection and testing Center of the Ministry of Agriculture: Brown rice rate 85.7%, milled rice rate 79.0%, head rice rate 77.5%, grain length (mm) 4.8,1.5%, chalkiness rate 50%, chalkiness 4.2%, transparency 2, alkali elimination value 7.0,gel consistency (mm) 82, amylose 17.8%, protein content 8.8%. In the above indicators, except for the transparency and chalkiness as the second-class standard of high-quality rice, the other indicators are up to the first-class standard of high-quality rice issued by the Ministry and have good palatability. " Under the same conditions, the heading date of "Changnongmian 2" was similar to that of "Wuyunjing 7", but the maturity was about 2 days later. It was generally sown in the middle of May, transplanting in the middle of June, heading from September 2 to 6, maturing in late October, and the whole green stage was 164 days. It belongs to the type of mid-mature and late japonica. Medium resistance to rice blast.

Yield performance: this variety participated in the cooperative joint evaluation of new rice varieties in Suzhou in 1995, and 5 pilot projects summarized the yield per mu 611.6kg, ranking first among 14 tested varieties (lines), increasing by 4.12% over Xiushui 122CK1 and 0.87% over "Taihujing 2" CK2. In 1996, it was promoted to participate in the comparative trial of new rice varieties in Suzhou, and the average 641.8kg per mu in 7 pilot projects ranked first among the 6 tested varieties (lines), which increased by 1.21% over the control Tai Mu Jing 2, and was the only variety that exceeded Taihu Jing 2. In 1998, it was promoted to participate in the single evening group regional trial in Jiangsu Province. The average yield per mu of 10 pilot sites was 667.6kg, ranking first among 11 tested varieties (lines). The yield of Wuyunjing 7 CK2 was 1.8% higher than that of Wuyujing 7 and 6.83% higher than that of CK1 Wuyujing 2. In view of the outstanding performance of this strain, it took part in the provincial production test at the same time in 1999. Under unfavorable climatic conditions, it withstood the test and showed strong adaptability. The yield still ranks first, with a yield of 579.61kg per mu, which is 2.1% higher than that of the control I Wuyunjing 7 and 12.7% higher than that of the control Wuyujing 2. in the same year, it participated in the provincial production test, and the average yield per mu was also ranked 1st, which was 11.7% higher than that of the control Wuqingjing 2, showing high and stable yield.

Institute of Agricultural Sciences, Changshu City, Jiangsu Province

Regional and technical Changnongjing 2 has weak tillering ability and high panicle rate, so we should pay attention to the following cultivation measures: 1. Cultivation of strong seedlings: Changnongjing No. 2 has weak tillering ability, which is more important for cultivating strong seedlings of suitable age. In the cultivation of large seedlings by water, the techniques of raising seedlings should be as follows: first, strict seed disinfection before sowing to prevent the occurrence of evil seedling disease; second, sowing at the right time, it is appropriate to sow on May 18-20; third, sparse sowing is appropriate, and the sowing amount per mu of seedling field should be controlled at about 3Okg. The fourth is to apply enough fertilizer, and the rice field always uses pure N16~18kg/ mu, of which 50% is basal fertilizer, 30% is weaning fertilizer, and 20% is stand-up fertilizer; fifth, timely use of medicine to control grass pests and control diseases and insect pests. two。 Timely transplanting: timely and early transplanting is beneficial to low tillering and make up for the weakness of poor tillering. the optimum period for transplanting is June 15-20, seedling age 28-30 days, transplanting density, through 2 years of production practice, row spacing 8 inches, plant spacing 3.5 inches is reasonable, no less than 20,000 holes per mu, 4 seedlings per hole (including large tiller seedlings), the basic seedling is about 80,000, in order to ensure a certain number of ears per mu. 3. Scientific application of fertilizer: Changnongjing 2 is a large panicle variety with strong fertilizer tolerance and lodging resistance. in fertilizer management, the total use of pure N in the field is controlled in 17~18kg/667m2, and the maximum amount of pure N per mu is not more than 2Okg. It is better to apply fertilizer early rather than late, so as to avoid excessive application of panicle fertilizer, so as to avoid the increase of batch grain, aggravation of disease and adverse effect of ripening color difference. Fertilizer operation is as follows: 60% in the early stage (application of base, flour fertilizer and tiller fertilizer before the end of June), 20% in the middle stage (long coarse fertilizer), and 20% in the later stage (panicle fertilizer). 4. Rational irrigation: field water slurry management for high-yield cultivation should be done as follows: shallow water during transplanting, ensuring transplanting quality, maintaining water layer during returning to green stage, promoting tillering in shallow water layer at tillering stage, improving fertilizer efficiency and promoting tillering. According to the seedling condition around July 18, combined with the application of long and coarse fertilizer, the field should be shelved from August 15 to heading stage, the field should be kept shallow, dry and wet after heading, and water should not be cut off prematurely in the later stage. In order to avoid reducing the grain weight, the water is cut off a week before harvest to ensure that the green stalk is ripe, the grain is full, and the harvest is high. In addition, we should pay attention to the prevention and control of diseases and pests, with emphasis on the control of rice stem borer and panicle rice blast, and the control of other diseases and insect pests can be carried out with reference to the same type of varieties.