Lushu No.3 is a kind of sweet potato, originally codenamed 79-555, which is from Yantai Institute of Agricultural Sciences, Shandong ProvinceWulian County Agricultural BureauwithXushu No. 18It is a female parent and American red is a male parent.It was approved by Shandong Crop Variety Approval Committee in 1989.
Selected by Yantai Institute of Agricultural Sciences, Shandong Province.The stem and leaf grow vigorously, and the yield is high. The crude protein content of stem and leaf is 10.89% and 26.02% respectively, which has high feeding value.The potato is spindle shaped, with purple skin and white flesh.The drying rate of potato blocks was 25.9%, the content of dry starch was 63.39%, soluble sugar was 7.82%, crude protein was 4.78%, and crude fiber was 4.28%.The yield of fresh potatoes per mu is about 2000 kg.It is resistant to stem nematode and root rot, with a density of 3000-3500 plants per mu.
Characteristics
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The top leaf is green, and other leaves are also green. The leaves are large, heart shaped, with light purple veins and leaf bases.The stem is green, thick and medium long.Potato pieces are short spindle shaped, with purple skin and white flesh.The drying rate of spring potatoes is 30.8%, and that of summer potatoes is 27.3%.Average taste.
The germination is good, and the stem and vine branches are medium.The tubers formed earlier, the tubers were concentrated, and the regularity was good.Storage resistance.Drought resistance and barren tolerance.Resistance to root rot, stem nematode, root knot nematode and black spot.The waterlogging resistance is poor.
Yield performance
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From 1986 to 1987, the regional test of new sweet potato varieties in Shandong Province showed that the average yield of spring potatoes in disease-free areas was 2321.0 kg, which was higher than that of control varietiesXushu No. 18An increase of 7.5%;The output of dried potato was 725.4 kg, 4.5% lower than that of the control.The yield of summer tubers is 1862.0kg per unit of fresh tubers, 1.3% higher than that of the control;506.2 kg of dried potato was produced, 7.9% less than the control;According to the test results in the mixed occurrence area of root rot, stem nematode disease and black spot disease, the dry potato yield was 500.2 kg, 204.3% more than that of Xushu 18, a monoclonal antibody to root rot disease, and 14.7% more than that of Qingnong 2, a disease resistant variety.
Key points of cultivation
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Due to drought resistance and barren tolerance, it is suitable for planting in general fertilizer and water conditions and in dry and thin lands in mountainous areas, but not in waterlogged and low-lying lands.When raising seedlings, medium and large tubers are used, seeds are thinly arranged, and sufficient base fertilizer is applied to cultivate strong seedlings.Plant as early as possible in a timely manner, and the earlier summer potatoes are planted, the better.The planting density of spring potato is about 3500 plants, and that of summer potato is about 4000 plants.In case of waterlogging in the middle and later growth stages, attention should be paid to the drainage of ponding in the field.
application prospect
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Because the variety is resistant to many diseasesRoot rot of sweet potato, stem nematode disease and black spot disease can be planted in the areas where they occur, especially in the areas where multiple diseases are mixed, which can increase production significantly, and should continue to be planted.It should not be used in non ward areas.[1]
