Ii you 725 (Rice)

II you 725 is a new high quality medium indica hybrid rice combination bred by Mianyang Institute of Agricultural Sciences in Sichuan Province. The combination showed the characteristics of large panicle, high yield potential, excellent rice quality, strong resistance, good adaptability and so on.

1. The high yield level participated in the production trial in Sichuan Province in 1997 and was planted in different ecological regions of Chengdu, Weiyuan, Bazhong, Wusheng and Zhongjiang. The average unit yield of 8.85t/hm2 was 8.57% higher than that of Shanyou 63. In 1997, 40hm2 was planted in Jiepai Town, Anxian County, and the yield was tested and accepted at multiple points. The per unit yield reached 9.345t/hm2, 13.78% higher than Shanyou 63. In the regional test of Hubei Province from 1998 to 1999, the average yield per unit area was 9.15t/hm2, which was 4.28% higher than that of Shanyou 63. In 2001, as a national new variety display, 200hm2 was planted in an County, Mianyang City, Sichuan Province. The yield was tested and accepted by the expert group, and the per unit yield reached 10.456t/hm2, which was 14.26% higher than that of Shanyou 63. The test and demonstration results show that II you 725 generally has a per unit yield of 8.25~9.375t/hm2, which is 5% and 15% higher than that of Shanyou 63, showing a higher yield level and yield potential.

two。 The whole growth period of II you 725 with good agronomic characters is 151-154 days, which is about 4 days longer than that of Shanyou 63 and 2 days shorter than that of II you 63. The plant type is compact, the stem is stout, the leaf is hard and straight, the flag leaf is longer, and the leaf color is dark green. It grows vigorously in the early stage, but changes color well in the later stage. Plant height 115cm, effective panicle 210 ~ 2.55 million / hm2, panicle length 26cm, the number of grains per panicle 170,195, seed setting rate more than 85%, 1000-grain weight about 27g.

3. The root system of II you 725 was well developed, the stem was stout, and the lodging resistance of you 725 was stronger than that of Shanyou 63. According to the plant protection institute of Sichuan Academy of Agricultural Sciences, II you 725 was inoculated with rice blast. The results showed that there were 5 grades of leaf blast, 5 grades of cervical blast, 8 grades of leaf blast and 9 grades of cervical blast of Shanyou 63. Through the two-year regional test in Sichuan Province, it was concluded that sheath blight was lightly susceptible, no self-leaf blight was found, and the resistance was significantly stronger than that of Shanyou 63.

4. The quality, palatability, appearance and eating quality of rice are obviously better than those of Shanyou 63. According to the test by the quality Supervision, Inspection and testing Center of the Ministry of Agriculture, the three indexes of milled rice rate (72.3%), alkali elimination value (6.6 grade) and protein content (10.0%) reached the first-grade high quality rice standard issued by the Ministry of Agriculture. The seven indexes of brown rice rate (80.6%), grain length (6.3m), length and width (ratio 2.5m), chalkiness (4.8m), transparency (grade 2), gel consistency (46mm) and amylose content (23.5%) reached the second grade high quality rice standard issued by the Ministry. The rice quality of Hubei regional test showed that the rate of brown rice was 80.64%, the rate of head rice was 53.93%, the content of amylose was 18.11%, the gel consistency was 49mm, and the comprehensive score reached the second-grade high-quality rice standard issued by the Ministry.

Cultivator Sichuan Mianyang Institute of Agricultural Sciences

1. Sowing in time, sowing II you 725 in Mianyang from late March to early April, sowing amount of 150kg/hm2 in seedling field, 22.5kg/hm2 in field, cultivating strong tiller seedlings with a seedling age of about 45 days.

two。 Reasonable close planting, the tillering ability of the basic seedling II you 725 is medium, so it needs reasonable close planting, and the foot seedling should be used to compete for more vines to obtain high yield. 225000 holes / hm2 were planted and double seedlings were planted in each hole to ensure that the basic seedlings were about 1.5 million / hm2.

3. Rational fertilization to ensure the demand of varieties for fertilizer nutrients II you 725 is a large panicle type combination, so the demand of varieties for fertilizer nutrients should be fully guaranteed. Honda should apply basic fertilizer, increase organic fertilizer and phosphorus and potassium fertilizer, and apply tiller fertilizer early to promote early growth and rapid development and ensure sufficient effective panicles. Generally, calcium superphosphate 675kg, potassium chloride 150kg, pure nitrogen 150~180kg were applied per hm2, and Zheng 18~3Okg sulfate was used as base fertilizer. The fertilization method should be "promoting, stable and skillful", so the base fertilizer accounts for 60%-70% in the early stage, and 20%-30% in the middle stage, and panicle fertilizer is skillfully applied in the later stage (7-10 days before heading) depending on the seedling growth.

4. Scientific management of water, timely shallow water irrigation to promote tillering in the early stage of drying, and began to dry the field when the stem and tiller seedlings reached 3 million / hm2, so that the highest seedlings were controlled within 3 million / hm2. During the period from booting to heading, the field should maintain the shallow water layer, dry and wet in the later stage, mainly moisturizing, so as to maintain roots and leaves until yellow maturity. Cut off the water about 5 days before maturity, should not cut off the water too early, so as not to affect the fruit.

5. The key to the comprehensive control of diseases and insect pests is to do a good job in the control of rice blast, sheath blight, borer and rice planthopper. At the same time, attention should be paid to the occurrence of rice false smut to ensure a bumper harvest.