A Dao 7

A new late-maturing and high-yielding rice variety A Dao 7 was introduced from Liaoning Institute of Saline Land improvement and Utilization in 1992 by Nongyi Liangfan Fang, and was systematically selected for 5 consecutive years.

The variety belongs to late-maturing and japonica rice type. It was sown around the end of April in Tarim River and Shajingzi reclamation area, and could be fully matured by the end of September. The whole growth period was 150-155 days. The adult plant height is about 90cm, the plant type is compact, the tillering ability is strong, the emergence, heading and maturity are neat and consistent, the plant is beautiful and healthy, the living plant is mature without premature senescence, the ear position is low, and the flowers are hidden in the leaves. The grain is long oval, the glume and stem are yellow, the 1000-grain weight is 24025g, the ear length is 17~20cm, the number of grains per ear is 80~llO, the seed setting rate is more than 90%, the ratio of grain to grass is 0.81, the rate of brown rice is 81%, the protein content is 6.62%, the moisture content is 11.9%, the amylose is 11.31%, the amylopectin is 60.56%, the gel consistency 76mm, the gelatinization temperature is less than 70 ℃, the transparency is good, the abdominal whitening rate is small, and the eating quality is excellent. The seedling has strong growth potential, early tillering and easy management; strong cold tolerance and saline-alkali tolerance, high lodging resistance; field quarantine and high resistance to rice blast.

Yield performance: participated in the repeated experiments of rice varieties (lines) from 1993 to 1995, the average 666.7m2 yield was 836.7kg, 803.6kg and 890kg respectively, which increased by 3.04%, 5.2% and 6.7% compared with the control Shajiao 5, respectively. In the variety comparison experiment from 1995 to 1996, the average 666.7m2 yield was 832.6kg and 700.5kg, respectively, which increased by 4.67% and 11.3% compared with the control Shajiao 5, respectively. After being popularized and planted in the field, the per unit yield level is stable at 600~800kg, which is 7% and 10% higher than that of Shajiao 5. In 1997, 2133.3hm2 was planted in the first agricultural division, in which the average 27.2hm2 yield of 13 companies of seven regiments was 1035.6 kg, and the average yield of 19.17hm2 of 16 companies of nine regiments was 1063.lkg. In 1998, 4793.2hm2 was planted in the first agricultural division, and the average yield of 19.53hm2 per unit area of 16 regiments and 3 companies was 1053kg.

The breeding ground of the first Agricultural Division of the Breeders

Region and technology 1. Yield structure: basic seedlings 220000 ~ 260000 plants / 667m2, total stem number 20kg/667m2, harvest panicles 400000 ~ 450000 / 667m2, grains per panicle 85 million 100 grains, 1000-grain weight 25g. two。 Preparation before sowing: irrigation and drainage should be matched, medium fertility mature land should be selected, land should be leveled strictly, artificial early leveling should be added to the level, so that the height difference in the field is less than an inch, so that the ground is flat, the canal is straight, the ridge is small, the edge is even, the corner is square, and there is no debris clean. The purity of the seed is 99%, the purity is 98%, and the germination rate is more than 95%. After mud treatment, the mud ratio is 5% to 8%. 3. Timely early sowing: the suitable sowing time is from April 15 to April 30. Artificial water broadcast 18kg/667m2, aerial broadcast 15kg/667m2. Three-material phosphate fertilizer 8~10g/667m2 is used to grow fertilizer. Artificial sowing and fertilizing are required to spread the seed twice. Water and fertilizer management: the whole water layer management applies the irrigation method of shallow, wet and dry alternately. Urea 38~40kg, phosphorus 8~10kg, zinc sulfate fertilizer 3kg and oil residue 40kg were applied to 667m2. Topdressing 3 times at tillering stage. Seedling fertilizer: urea 6kg/667m2, sulfuric acid 3kg/667m2, promoting tiller fertilizer when upright needle turned green to 1 leaf, urea 9kg/667m2, oil residue 40kg/667m2 and tillering fertilizer applied at 3.5 ~ 4 leaf stage, urea 1lkg/667m2 at 6 leaf stage. The seedling stage is mainly in the shallow water layer, and the water layer is 3~5cm. In the needle setting stage, the sunny day is selected to dry the field for 2 to 3 days, and the standard is Huahuashui. Keep 5~6cm in the water layer at the tillering stage, never cut off the water, and stop watering and drying the field for a week at the end of tillering to promote transformation. In the seedling stage, 667m2 used 10% Nongde, 2Cgao, 96% and 200g shallow water spray to control weeds chemically, and the shallow water layer 5~6cm should be maintained in the middle and later stage. According to the principle of "early yellow and early application, late yellow and late application, no yellow and no application", urea 1Okg/667m2 was applied. At the breaking stage, according to the growth of rice seedlings, appropriate additional application of primary grain fertilizer, urea 3~5kg/667m2. At the full heading stage, rotational irrigation was adopted to keep the alternation of dry and wet, and 80% of the rice began to stop water. The grain at the base of the ear begins to harvest when it is ripe.