Plant characters of New legume Green manure crop varieties Green manure Soybean Tainan 4 and Tainan 4

Tainan 4, a new green manure soybean variety, was selected by a single plant in Tainan Agricultural improvement Farm. It has the characteristics of small grain, rapid growth, high fresh grass and fertilizer content, and long coverage period. It is suitable for green manure cultivation in spring and summer and seed collection in autumn. It was reviewed and promoted by the crop new variety registration and nomenclature review group convened by the Agricultural Committee of the Executive Yuan in December 1988.

After the implementation of the upland farmland utilization adjustment plan, it is an important task to provide farmers with a long-term choice of green manure crops. in particular, the area of fallow planting of green manure has greatly increased, reaching more than 100,000 hectares in 1990. At present, there is only one kind of green manure crops to promote green manure crops in such a large area of fallow fields, and they all need the supply of imported seeds, which not only increases foreign exchange expenditure, but also is prone to diseases and insect pests. In addition, Tianjing green manure is suitable for short-term cultivation, and the planting time is 50-60 days, which is not suitable for mechanical application to avoid plant Lignification. As a result, the fallow period of a period is as long as 4-4.5 months, and Sesbania must be planted twice in order to achieve the effect of green manure application and long-term mulching, which relatively increases the burden on farmers to cultivate green manure. In view of this, in the first phase of Zuxuejia Town in 1989, the original planting of Tianjing green manure was adjusted to green manure soybean Tainan No. 4, and the period from planting to burying was as long as 150 days, and the problem of planting green manure twice in a fallow field was solved. After this variety is bred, it will not only provide excellent varieties for green manure cultivation in the first and second stages in China, but also cooperate with local seed collection to expand land use to alleviate the problem of partial conversion of miscellaneous grains. Tainan No. 4 is a variety bred by traditional breeding and is a non-genetically transferred crop. In addition to green manure, it can process healthy foods such as bean sprouts, tofu and soybean milk.

Characteristics of new varieties

First, agronomic characteristics

1. Growth habits: about 3-7 days after sowing, about 70-80 days in spring, 55-63 days in summer, 38-48 days in autumn, 150-160 days in spring, and 160 days in summer. 125 to 135 days, 94 to 104 days in autumn. The plant is sensitive to light, and its stems and leaves grow thickly in long days, which is suitable for green manure cultivation. It is easy to blossom and bear fruit in short days, so it is suitable for seed production.

two。 Maturity: late-maturing species, neat and consistent maturity, good defoliation at maturity.

3. Suitable planting period

The main results are as follows: (1) Green manure cultivation: the first and second stages of water supply dry field are used for green manure cultivation from early February to August.

(2) seed cultivation: from mid-August to late September in Tainan, and the best sowing time is mid-September.

4. The suitable cover period for green manure cultivation in spring is 80-160 days after sowing, while that in summer is 80-135 days after sowing.

5. Disease resistance: no purple spot was found in this variety without inoculation of pathogens and pesticide control, and the incidence of dew fungus and rust was lower than that of Kaohsiung Xuan 10.

6. Insect resistance: although the incidence of Liriomyza sinensis was high, it had little effect on fresh grass yield, and the harmful area ratio of other pests was lower than that of Gaoxiongxuan 10.

7. Adapt to soil: soil selection is not strict, sandy loam or loam is the most suitable, soil pH is 7.0 ~ the best of pH6.0.

8. Yield (1) fresh grass amount of green manure: 21000-37000 kg per hectare of fresh grass for 80 days of spring cropping, 20000-36000 kg per hectare of summer cropping, 113,251 kg of nitrogen per hectare, 20-36 kg of phosphoric anhydride and 122-245 kg of potassium oxide.

(2) seed yield: the yield of artificial harvest in autumn is 2200kg to 2800kg per hectare.

Second, plant characters.

1. Plant:. The plant height of spring cropping is 60 cm 107 cm, that of summer cropping is 70 cm 108 cm, that of autumn cropping is 39 cm 75 cm, the number of branches is about 3 cm, and the number of main stem nodes is 17 cm.

two。 Seedlings: young stems purple.

3. Stem: growing stem green.

4. Leaves: trifoliolate, leaflets ovoid, emerald green.

5. Flowers: purple.

6. Pods: pods are knife-shaped, yellowish brown, covered with brown velvet, 2 or 3 seeds per pod.

7. Seeds: oval, seed coat yellowish green, cotyledons yellow, navel brown, 100 seeds weighing 6-10 grams.