The selection criteria for summer spinach varieties are that the summer bolting is not too late, the heat resistance is strong, and the growth is rapid. The types of summer spinach currently cultivated throughout the country are as follows. 1. All-round spinach: Introduced from Hong Kong. It is heat-resistant, cold-resistant, widely adaptable, strong in winter, late in bolting, fast growing, and capable of rapid growth at temperatures of 3-28°C. Plant stands upright, plant height 30-35 centimeters, leaves 7-9 pieces, mass of about 100 grams per plant. Leaves dark green, thick and thick, smooth leaves, length 30-35 cm, width 10-15 cm. Less astringent, soft texture. 80-110 days of growth, resistance to downy mildew, anthrax, virus disease. 2. Hua Bo No.1: A generation of hybrids bred by Huazhong Agricultural University. Precocious, 40-60 days of growth, plant half-upright, plant height 30 cm. Ye Ji-shaped, with a deep lack of carved pair. The tip is blunt, the leaves are hypertrophic and the quality is good. High temperature, resistance to downy mildew and virus disease, high yield. 3, Guangdong round leaf spinach: imported from Guangdong, seeds without thorns, leaves oval, heat-resistant, fast growth, intolerable cold, before the cold to come to close. 4. Joint No. 1: A generation of hybrids developed by Shanghai Agricultural College. The seeds are thorny, the plants are half open, the leaves are arrow-shaped, and the leaves are large and hypertrophic. They grow rapidly and are more resistant to high temperatures. They are sown in high temperatures and rainy seasons to produce seedlings and preserve seedlings. The seed has a long period of dormancy, and the germination rate of the new seed under direct high temperature is not high. 30 days after sowing can be harvested. 5. Spring and Autumn Days: The varieties introduced from Japan by Shanxi Province. The plants are robust, semi-upright, and the leaves are clustered. The leaves are oblong, the tip is blunt, and the leaves are hypertrophic. The quality of a single plant is 200 grams, and the quality is tender. The single leaf mass is 20 grams. No astringency, excellent quality. Strong resistance to disease, heat resistance, convulsions later, the growth period is about 10 days longer than the general round-leaved spinach. 6, late pumping big leaves: Shanxi Agricultural University, selected new varieties of vegetable research, growth period of more than 50 days. Plant height 25 cm, degree of development 50 cm. The leaves are broad, broadly arrowheaded, with a round tip, 32-40 cm long, 14-18 cm wide, and very little fiber. The seed has no thorns. Convulsions are 15-20 days later than normal varieties, and generally produce more than 2500 kg per mu.
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