The Zhongguo No. 3 is a conventional early rice variety developed by the Chinese Rice Research Institute using the Jinzao47 tissue culture and somatic asexual variation. In January 2005, it was approved by the Jiangxi Provincial Crop Variety Approval Committee. Characteristics: The whole growth period was 107.1 days, 1.4 days earlier than the control Zhejiang 733. The plant type of this variety is moderate and orderly, with dark green leaves, wide blade width, weak tillering power, less effective panicles, more grains per panicle, and a high seed setting rate. The plant height is 78.4 centimeters, the effective ear is 213,000 mu, the total number of grains per panicle is 112.7 grains, the number of grains per panicle is 89.7 grains, the seed setting rate is 79.6%, and the grain weight is 25.2 g. Roughness 81.6%, polished rice rate 67.8%, whole polished rice rate 42.7%, chalkiness rate 85%, chalkiness 12.8%, amylose content 22.07%, gel consistency 30mm, grain length 5.3mm, aspect ratio 2.1 , Transparency level 3, base elimination value of 5. Natural susceptibility to rice blast resistance: 0 in seedlings, 3 in leafhoppers, and 0 in ear blasts. Production performance: 2003-2004 participated in the regional rice experiment in Jiangxi Province. The average yield per mu in 2003 was 435.41 kg, which was 1.53% lower than the control Zhejiang 733. In 2004, the average yield per mu was 457.60 kg, 2.29% less than the control Zhejiang 733. Cultivation Techniques: Seed sowing from the end of March to the beginning of April, with a seeding rate of 30-35 kg/mu and 5 kg/mu. Age 28-30 days, transplanting specifications for the 55-inch, 5-6 seedlings per hole. Fertilize base fertilizer and apply topdressing as early as possible; basal manure mainly uses organic fertilizer, appropriate application of phosphorus and potassium fertilizer; apply panicle fertilizer, increase seed setting rate and 1000-grain weight. During the period of childbirth, the field is controlled in time, and moist irrigation is used in the later period to prevent the water from being cut off prematurely to ensure sufficient grouting. Pay attention to pest control. It is suitable for planting in the north of central Hebei.
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