Longke 638S×green silk seedling

Variety source: Longke 638S×green silk seedlings

Characteristics: Indica two-line hybrid rice variety. The mid-season rice planted in the middle and lower reaches of the Yangtze River has a full growth period of 137.2 days, which is 4.4 days later than the control Fengliangyou No. 4. The plant height is 129.4 cm, the ear length is 24.6 cm, the effective ear number per mu is 169,000 ears, the total number of grains per ear is 259.2, the seed setting rate is 85.4%, and the thousand-grain weight is 24.9 grams. Resistance: The comprehensive index of rice blast was 3.4 and 2.0 respectively in two years. The loss rate of ear neck blast was the highest level 7. It was susceptible to rice blast, bacterial blight, highly susceptible to brown planthopper, and had strong heat tolerance at heading stage. Main indicators of rice quality: whole rice rate 64.2%, chalky grain rate 28%, chalkiness 7.9%, amylose content 12.9%, gel consistency 84 mm, length-to-width ratio 3.1, reaching the agricultural industry "Edible Rice Variety Quality" Standard level three.

Yield performance: Participated in the regional test of the late-maturing mid-indica in the middle and lower reaches of the Yangtze River in 2016. The average yield was 658.88 kg per mu, which was 10.06% higher than the control Fengliangyou No. 4; the trial was continued in 2017 and the average yield was 646.13 kg per mu, which was better than the control Fengliang The yield of No. 4 increased by 3.65%; the average yield per mu in the two-year regional test was 652.51 kg, which was an increase of 6.86% compared to the control Fengliangyou No. 4; in the 2017 production test, the average yield was 649.47 kg per mu, which was an increase of 6.26% compared to the control Fengliangyou No. 4.

Cultivation techniques: 1. Seedling raising: Sowing seedlings at the right time, raising seedlings in dry or moist areas, and cultivating multi-tiller and strong seedlings. 2. Transplanting: Transplant at the right time, the age of seedlings is 30 days, the planting specifications of medium and high fertility fields are 16.7 cm × 26.7 cm, and the density of medium and lower fertility fields should be increased appropriately. 3. Fertilizer and water management: the total amount of fertilizer required per mu of field is 14-18 kg of pure nitrogen, 40-50 kg of phosphate fertilizer, and 15 kg of potash fertilizer. 60% of the total amount is used as base fertilizer. After transplanting live trees, topdressing is applied 5-8 per mu Kg of urea promotes tillering, and topdressing 3 to 5 kg of urea per mu from booting to breaking stage is used as ear and grain fertilizer. The irrigation method of "planting seedlings in shallow water, living trees in inch of water, thin-water tillers, deep-water heading, and dry and wet in the later stage" is adopted, and the seedlings are drained and sun-dried in time when each mu reaches 180,000 seedlings. 4. Pest control: pay attention to timely control of rice blast, bacterial blight, rice planthopper, rice smut and other pests.

Approval number: National Approved Rice 20186064

Features: Energy-saving rice, large ears, high yield, good rice quality