Shanyou 122 (Rice)

[basic situation] Shanyou 122 is a temperature-sensitive medium-late maturing combination of high quality restorer line Guanghui 122 (Lian836-1 Minghui 63 / Guanghui 3550) newly bred by our institute and Zhenshan 97A. The cumulative extension area has reached 76900 hm2 in our province, which has become the leading combination of medium and late maturing hybrid rice in our province.

[characteristics] the whole growth period of Shanyou 122 as early rice is 122 to 128 days, which is 6 days later than that of Shanyou 96 and 5 days earlier than that of Shanyou 63. Planting early rice in Meizhou and Heyuan can make full use of local light energy to increase its yield. The whole growth period of late rice is about 110 days, which is not only a certain growth period, but also suitable for the local safe heading stage and the best filling stage, which is the best ripening period in some rice growing areas of our province.

In the identification of blast resistance of hybrid rice in Guangdong Province, the blast resistance ratio of Shanyou 122 was 80%, of which group A was 50%, group B was 100%, group C was 66.67%, group D was 100%, group E was 100%, group F was 80%, group G was 100%, and was not resistant to bacterial blight (the total resistance score was grade 7). Planting in various parts of our province showed resistance to rice blast, and no harmful loss was found.

The appearance of early rice in Guangdong regional trial was identified as grade 3, which was one grade higher than that of Shanyou 96 and Shanyou 63. Rice quality analysis results: grain length 6.26mm, grain width 2.22mm, aspect ratio 2.82, chalkiness rate 50%, chalkiness 13.5%, amylose 22.1%, gel consistency 91mm. These indexes are obviously improved compared with Shanyou 96 and Shanyou 63, especially amylose and gel consistency are more prominent, showing moderate softness and hardness of rice, good palatability and suitable for the taste of the public.

Plant height 99.3~99.9cm, ear length 22cm about, 121-123 grains per panicle, seed setting rate 83%-85%, 1000-grain weight 25-26g. The growth period is similar to that of Shanyou 46, the vegetative growth period is early and rapid, the tillering ability is strong, and the growth is prosperous; in the reproductive period, the leaves are compact and straight, the utilization rate of light is good, and the response to temperature and light is small. The elasticity of seedling age is good, the growth and growth period are relatively stable, the culm is short and thick, the lodging resistance is good, the cold tolerance is strong, it is easy to plant and tube, and the mature color is good in the later stage. Under the condition of better fertilizer and water, the yield is high and stable, which adapts to the current planting management level of farmers.

The male parent Guanghui 122 has strong tillering ability, more effective panicles, large amount of pollen and good flowering time. In 1998, the average yield of spring 11.33hm2 in Hainan was 3.21t/hm2, and the yield of 3hm2 reached 3.59t/hm2. Generally, the 525~600kg/hm2 is higher than that of other Shanyou combinations and has better economic benefits of seed production.

Zaozao participated in the regional trial of medium maturity group of hybrid rice in Guangdong Province, and the average yield per unit area was 7.23t/hm2, which was 11.24% higher than that of Shanyou 96, which was significantly higher than that of Shanyou 96. The daily yield was 56.55kg/hm2, which was 6.19% higher than that of the control. In 1998, Zaozao participated in the retest of the late-maturing group of hybrid rice, and the average yield per unit area was 6.55t/hm2, which was 2.84% lower than that of Shanyou 63, but not significantly lower than that of Shanyou 63. The daily yield was 53.7kg/hm2, which was 1.12% higher than that of Shanyou 63. The early ripening stage was 6 days later than that of Shanyou 96 and 5 days earlier than that of Shanyou 63. When 7260hm2 was planted in Meizhou City in 1998, the general yield per unit area was 7.5t/hm2, and the high yield field was more than 9.Ot/hm2. Large area planting in Meizhou, Heyuan and Shaoguan of Guangdong Province showed extensive adaptability and high stability, especially in late-growing alpine areas and areas with more chilling injuries, its high and stable yield performance was more prominent. It has become an indispensable hybrid rice combination in some rice-growing areas of our province.

Rice Research Institute of Guangdong Academy of Agricultural Sciences

[region and technology] a) pay attention to sparse sowing, uniform sowing, cultivating green tillers and strong seedlings, and sowing amount of 150.0~187.5kg/hm2 in seedling field. B) sowing and transplanting in time, the seedling age should be 30 days early and 18-20 days late. C) reasonable close planting, full transplanting of basic seedlings, general transplanting specification of 16.5cm × 19.8cm, and 2 grain seedlings per hole. D) implement the combination of shallow, dew and sun pipe water method, so that the combination of transplanting in shallow water, living seedlings in an inch of water, tillering in thin water, and drying the field with enough seedlings. E) adequate basal fertilizer, early heavy application of tiller fertilizer to promote early growth and rapid development of tillers, and panicle fertilizer in the later stage. Timely prevention and control of insect pests to achieve high and stable yield.

The main points of seed production techniques are as follows: a) the male parent Guanghui 122 has strong tillering ability and more effective panicles, and the general seed production field reaches 1.5 million ~ 1.8 million spikes / hm2. The seedlings were sown in late December in Hainan, the seedling age was 2830 days, the sowing period was 103-105 days, and the number of leaves on the main stem was 17.2, while in autumn in Guangdong, the sowing period was 72-74 days, and the number of leaves on the main stem was 15.5. The flowering period of single plant is 8-10 days, the peak flowering period is 3-7 days after heading, the flowering period of single panicle is 4-5 days, and the full flowering period is 10-20-11-100. It is better to have a difference of 15 ±2 days and 42 leaves for parents in autumn in Guangdong and 25 ±2 days in Hainan. The male parent was sown in two stages, with a difference of 3 days. B) cultivate age-appropriate tillers and strong seedlings, reasonably close planting, and establish a reasonable population structure. The sowing rate of parents in seedling field was 112.5 and 150.Okg/hm2, respectively, the male parent 16.7cm × 23.3cm, the female parent 10.Ocm × 3.3cm, and the ratio of parents to line was 2: (14: 16). C) Scientific fertilization and rational use of water. Adopt the fertilization principle of front attack, middle control and post-supplement; return to green in an inch of water, tiller in thin water, sun-dry the field enough, and combine dry and wet in the later stage.

D) timely spraying "920" and artificial pollination to improve the seed setting rate of outcrossing. Timely prevention and control of diseases and insect pests and strict removal of miscellaneous and inferior, to ensure quality.