Breeding and High-yielding cultivation techniques of Lindao 12

1 the process of variety breeding

In 1999, Linyi Rice Research Institute adopted radiation mutagenesis breeding method, Yujing 6 seeds were treated with 60Co α-ray 40000 roentgen dose 500g, Mo generation was planted in that year, the population was highly sterile and all seeds (M1 generation) were harvested in autumn, and M _ 1 generation was planted in winter of the same year, the population was highly separated and all M2 seeds were harvested. In 2000, M _ 2 generation was planted by dichotomy group breeding. 36 individual plants were selected from the mutagenic population in autumn, and M3 seeds were planted by pedigree method in the second southern breeding in winter of that year. The variety comparison test was carried out in the institute in 2001 and continued in 2002. Through the comparison of varieties, it was found that the growth period of the third line was 3-5 days earlier than that of the control Yujing 6, with strong tillering ability, high panicle rate, uniform panicle layer, golden color, significant yield increase, good rice quality, fresh taste and outstanding comprehensive characters. It was recommended to participate in the provincial rice regional trial in 2003 and continued in 2004. Participated in the rice production experiment of the whole province in 2005. In April 2006, it was approved by Shandong crop Variety approval Committee (approval No.: Lunongxian 2006038) and named Lindao 12.

2Variety characteristics

The whole growth period of Lindao 12 in Shandong main rice area is 150 days for water raising and 156 days for dry raising. It is a mid-late maturing variety in japonica. The plant height is about 100cm, the plant type is compact, the tillering ability is strong, the flag leaf is thrust up, and the population self-regulation ability is strong. The panicle type is larger, the grain is more, the panicle layer is neat and consistent, the panicle length is 16cm, the effective spike per mu is 249000, the panicle rate is 73.2%, the total number of grains per panicle is about 120grains, the number of filled grains is about 95, the seed setting rate is 79.2%, and the 1000-grain weight is about 25g.

The regional test of this variety showed light susceptibility to seedling blast, ear neck blast, medium resistance to sheath blight, stripe blight, rice false smut and high resistance to bacterial blight. The resistance of the variety was identified by Rice Research Institute of Chinese Academy of Agricultural Sciences in 2003. the variety was moderately susceptible to seedling blast, panicle neck blast, bacterial blight in seedling stage and middle resistance in adult stage. After years of variety comparison, regional test, health test and production demonstration, this variety is more resistant to pests such as rice stem borer, Chilo suppressalis, rice leaf borer and rice planthopper, and the damage of rice thrips, rice leafhoppers and rice locusts is relatively mild.

Determined by the Rice and products quality Supervision, Inspection and Test Center (Hangzhou) of the Ministry of Agriculture in 2005, the brown rice rate of this variety was 83.9%, milled rice rate 76.8%, head rice rate 73.8%, grain length 5.2mm, length-width ratio 1.9,34% chalky grain rate, 4.9% chalkiness degree, transparency grade 2, alkali elimination value grade 7.0, gel consistency 65mm, amylose content 18.2%, protein 10.2%.

Yield performance of 3 varieties

In the quality comparison test from 2001 to 2002, the average yield per mu in two years was 575.8kg, which was 12.1% higher than that of the control variety Yujing 6, reaching a very significant level.

Participated in the regional experience of rice in Shandong Province from 2003 to 2004, the average yield per mu in two years was 503.1kg, which was 8.1% higher than that of Yujing 6.

In 2005, he participated in the rice production experiment in Shandong Province, and the average yield per mu was 508.54kg, which was 2.6% higher than that of Yujing 6, ranking second.

4High-yielding cultivation techniques

Lindao 12 is suitable for popularizing and planting wheat stubble rice in southern Shandong Ku irrigation area and southwest Shandong lakeside rice area. It can also be used as wheat stubble rice in the suitable areas of Jiangsu and Yujing 6 in central Henan and spring rice in northern Shandong. It is suggested to be used as a demonstration for the production of high quality rice and the main selected varieties of organic rice.

No matter dry cultivation or water cultivation, the amount of seed used in each mu of field is generally 3.0~3.5kg, and the maximum amount of seed used is no more than 4kg. Before sowing seeds in the seedling field, make 100 grams or evil line clear, soak the seeds for 5 to 7 days to prevent evil seedling disease, rice false smut, nematode and so on. For weeding before sprouting in seedling field, Nongshita 0.3kg and butachlor 0.3kg were used to evenly spray water 60kg (it is necessary to increase the amount of water when the soil is dry) to seal the soil surface medicament per mu. After sprouting, barnyardgrass 1kg was used to spray water 60kg twice in two days in two-leaf mu of paspalum grass, or a mixture of barnyardicide king and rice nongle was used to spray water 60kg.

4.2 rational fertilization, controlling nitrogen and increasing potassium should grasp the principle of being heavy before and after being light, and can also be "one bombardment". Ammonium bicarbonate 50kg or urea 17.5~20kg, diammonium phosphate 15kg, potassium fertilizer 15kg, zinc fertilizer 2kg / mu, ternary compound fertilizer 60~75kg and zinc fertilizer 2kg can also be applied as field bottom fertilizer per mu. Topdressing was divided into two times: topdressing tiller fertilizer 5-7 days after transplanting, applying urea 7.5kg per mu, topdressing urea 5kg and potassium fertilizer 10kg per mu at the early stage of jointing and booting. The application of pure nitrogen per mu should not exceed 19kg in the whole field period. In the middle and later stage of the field, little or no nitrogen fertilizer should be applied to prevent excessive nitrogen fertilizer, resulting in greedy green late ripening. Foliar fertilizer was sprayed in the later stage, and potassium dihydrogen acid and Zhuangduo foliar fertilizer were sprayed in early September to promote grain fullness.

4.3.reasonable close planting, early prevention of diseases and insect pests this variety has strong tillering ability, should widen row spacing, large and small row planting, large row 30~40cm, small row 15~20cm, pier distance 10~12cm, 2-3 seedlings per pier, do not exceed 3 seedlings. Diseases and insect pests should give priority to prevention, early prevention and early treatment.

Three times of medicine in the seedling field: the first time after the three-leaf stage, omethoate and imidacloprid were used to kill gray planthopper to prevent stripe blight; the second time, methamidophos was used to control gray planthopper, thrips and drill worms 1-3 days before wheat harvest; the third time, methamidophos was sprayed again 1-2 days before transplanting to control the overwintering generation of heart-drilling insects (Chilo suppressalis).

Three times in the field: Jinggangmycin and methamidophos were sprayed before and after July 20 to control sheath blight and the first generation of heart-drilling insects; the second and third times were sprayed before and after heading in mid and late August, focusing on the control of neck blast, white leaf blight, rice leaf borer, rice planthopper and other diseases and insect pests.

4.4 reasonable irrigation, timely roasting the field in an inch of water, thin water tillering, dry and wet alternating after turning green, timely roasting the field enough seedlings, and controlling ineffective tillering; especially in the middle and later stage, it is not suitable to soak in deep water for a long time, so that the diseases and insect pests are light, the plants are strong, the grain is full, and the yield is high and stable.