Nitrogen deficiency in spinach and its control measures
Spinach nitrogen deficiency: leaf color light green, basal leaves (old) yellow, gradually upward development, brown when dry. Plant short, branches (tillers) less, premature aging phenomenon. Control method: apply enough base fertilizer, apply decomposed fertilizer 2000-3000 kg per mu, phosphorus fertilizer 30-35 kg, potassium fertilizer 10-15 kg. 2-3 When the leaves are true, combine with thinning and topdressing once, and apply urea 7.5-10 kg per mu. 6-7 15-20 kg urea per mu at leaf stage. Spinach winter cultivation, after spring temperature stability (no ice), such as topsoil drought, seedling heart leaves green, to early irrigation return green water. Autumn spinach, 2 leaf stage combined with thinning and topdressing once, 4-5 leaf watering topdressing, mainly available nitrogen fertilizer. During spinach growth to keep the soil moist, in case of drought to timely irrigation or combined with topdressing nitrogen fertilizer.
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Prevention and comprehensive treatment of downy mildew in spinach
The disease is caused by a fungus called spinach downy mildew. The main damage to the front of the leaf, disease spot yellowish, irregular shape, different sizes, diameter 3mur17mm, the edge is not obvious. After the disease spot enlarged, it connected with each other and became brown and withered in the later stage, and the gray-purple mildew layer was produced on the disease spot on the back of the leaf. The disease comes from the outer leaves.
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Ingenious management measures for spinach sowing
After spinach sowing, buckle the greenhouse, generally two water seedlings, and then irrigate one water 10 days after emergence. After the two true leaves of spinach unfold, the leaf number, leaf weight and leaf area increase rapidly, keep the soil moist before 3-4 leaves, apply 25 kg ammonium bicarbonate per mu, shallow hoe once, remove the dense seedlings from time to time, and control the water properly. In November.
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