Pingnan Junong Mountain Farming Specialized Farmers Cooperative
How to fertilize papaya? How to control papaya blight?
Papaya is a characteristic fruit that grows in the tropics and subtropics. It tastes sweet, has a smooth taste, and has beauty effects. It is deeply loved by people. So how to fertilize papaya? How to control papaya blight? Let's take a look with the editor below!
How to fertilize papaya?
Spring papaya is generally planted from late February to early March. It is recommended to plant 200 plants per mu, with 5 kg of decomposed chicken manure, 1 kg of superphosphate, and 0.5 kg of lime per plant, mixed with soil and applied to the planting hole. Pigeon manure, pig manure, EM bio-organic fertilizer (effective microbial organic fertilizer) can also be used as base fertilizer for papaya, with high nutritional content and long-lasting fertilizer effect.
Papaya in March and April after planting is a key period to promote rapid growth and early flowering of papaya. During this period, the tender roots of papaya seedlings grow shallow, and the fertilization should be from thin to thick, from less to more, with nitrogen as the mainstay. Apply once every 10 days and apply 5 times in total. 10 to 15 days after papaya planting, after the leaves are normally extended, apply 10 grams of urea per plant, spreading or drenching with water; after about 10 days , apply the second topdressing, apply 10 grams of urea per plant; after that, apply 10 grams of urea per plant Topdressing the third, fourth and fifth fertilizers for 10 days, 20 grams, 30 grams and 30 grams of urea per plant. During this period, it is better to spray 0.2%~0.3% urea solution or potassium dihydrogen phosphate solution on foliage every 7~10 days in combination with spraying fungicides.
Flower buds appear after papaya has a number of leaves after planting. Papaya should increase the amount of fertilizer, especially scale and potassium, before and after budding. It is recommended that 100 grams of compound fertilizer (nitrogen:phosphorus:potassium=15:15 :15) be applied to each plant in early May, and the same amount of compound fertilizer shall be applied in late May to maintain strong plant growth and good flower bud differentiation. To prevent the occurrence of papaya boron deficiency, apply 5 grams of borax or 3 grams of boric acid per plant, combined with spraying or spraying 0.2% boric acid or 0.3% borax solution once a week for 4 to 5 times...
June to October is the period when papaya continues to grow and bloom and set fruits. A lot of fertilizer is needed to meet the needs of lower fruit development and upper flowering and fruit setting. It is recommended to apply compound fertilizer each time in the first ten days of June and the second ten days of June, each time 100 grams per plant; in July, August, September, and October, apply compound fertilizer once each time, 150 grams per plant each time, and add decomposed peanuts in August. Bran fertilizer, 500 grams per plant, in order to improve fruit quality.
How to control papaya blight?
1. Pathogen: Oomycetes.
2. Symptoms: The damaged fruit first appeared with water-soaking disease spots and exuded jelly, which expanded while producing white mycelium. The sporangia on the mycelium produced migratory spores and infected healthy parts, finally causing fruit drop. Both seedlings and growing plants can be damaged, causing black root rot, and diseased plants fall down and die.
3. Onset ecology:
(1) The pathogen can remain in the soil, and it can be spread by wind and rain, snails, and irrigation water.
(2) The suitable temperature for onset is 28～32℃.
(3) The soil is acidic, too humid, poor drainage or too much nitrogen fertilizer, which promotes the occurrence of this disease.
4. Prevention method:
(1) Choose a well-drained area for planting.
(2) Select disease-resistant varieties, Tainong No. 1 has strong disease resistance.
(3) Avoid continuous cropping and rotate cropping with paddy fields.
(4) Avoid too dense planting, and pay attention to ventilation and light transmission.
(5) Use chicken dung or cow dung as base fertilizer. Others such as bean cake or compost are less suitable.
(6) Diseased or overripe fruits should be removed at any time and moved out of the orchard.
(7) Pay attention to the prevention and control of snails and ants.
(8) Prevention in rainy season: Perchlordane has been banned from sale on October 1, 1977. You can refer to the use of 80% zinc-manganese Naipu wettable powder 500 times dilution or other copper-containing chemicals for prevention and treatment.