How to grow green asparagus? the planting method of green asparagus

The sandy loam soil with deep soil layer, high organic matter content, good permeability and refreshing water and good drainage and irrigation conditions should be selected, and the soil ph should be neutral. Fertilization: timely and rational application of bud-promoting fertilizer, relay fertilizer and autumn fertilizer. Prevention and control of diseases and insect pests: mainly prevent asparagus stem blight, the methods of soil disinfection and garden disinfection can be adopted, and the method of chemical root irrigation can be chosen according to the actual situation.

Asparagus is cold-resistant, drought-tolerant, chlorine-resistant and alkali-tolerant, and is suitable for growing in sandy loam and loam with deep soil layer, high organic matter content, good permeability and freshness, and good drainage and irrigation conditions. acid soil and heavy saline-alkali soil less than 5.5 or more than 8 are not suitable for cultivation.

I. Scientific fertilization

1. Skillful application of bud-promoting fertilizer: all organic fertilizer can be re-applied at one time, or 80% of the total amount can be applied. For a plot with an annual output of 1000 kg of asparagus per mu, 50 kg of asparagus special fertilizer (CL) 25-5-15 should be used, combined with loosening the soil of the bamboo shoot field in spring, 30 cm from the edge of the plant row, and 10 cm trench should be opened into the buried soil to seal.

2. Supplementary application of relay fertilizer: relay fertilizer must be applied many times during the 4 months of bamboo shoot picking. The temperature at the initial stage of picking bamboo shoots is low and can be applied in trench soil. With the increase of air temperature, it can be combined with irrigation and water to adjust fertilizer. It is suggested that 150kg of CL 25-5-15 asparagus special fertilizer should be applied per mu, and asparagus special water-soluble fertilizer should be applied in the later stage.

3. Heavy application of autumn fertilizer: after the end of picking asparagus, turn the stem and leave the tree, it is necessary to re-apply autumn fertilizer, generally from late August to early September in the middle and south of Hebei Province. 70 kg of CL 22-10-10 asparagus special fertilizer was applied per mu, and the remaining organic fertilizer was applied at the same time.

Second, the law of fertilizer demand

1. The normal growth of asparagus needs a variety of nutrients, in a large number of elements, nitrogen and potassium are more, but phosphorus is less, and calcium, zinc, manganese and chlorine are indispensable in trace elements.

2. In the middle and south of Hebei Province, asparagus entering the bamboo shoot collection period (that is, more than 2 years old), the bamboo shoot collection period and autumn period are 3-4 months respectively. The experimental results show that for every 1000 kg asparagus production, about 17 kg of pure nitrogen, 4.5kg of phosphorus and 15kg of potassium are needed. The proportion of the three elements is about 3.8, 1 and 3. 3. Specific fertilization methods: heavy application of organic fertilizer at the beginning of the year, while the application of chemical fertilizer is light before and after heavy.

III. Pest control

1. The main disease is asparagus stem blight. Up to now, there is no radical cure for the disease, only prevention.

2. Soil disinfection: that is, 50% thiram powder 2 kg, mixed fine soil 50 kg, combined with phoxim granules or chlorpyrifos granules to kill underground pests, one-time application during soil preparation. It can also be applied in ditches or at acupoints.

3. Clear the garden thoroughly: the stems and branches of the aboveground part of the bamboo shoot field are transported out of the field and treated innocuously. Clearing the garden in winter and spring is as important as turning the stem in autumn.

4. Chemical root irrigation: the root can be irrigated with 45% Schenanin 300 times solution. From the end of May to the end of August, fungicides should be sprayed alternately, such as metoprolol, metoprolol, etc., and should be sprayed in time after rain, or copper preparation can be used alternately twice to strengthen the protective function.

5. Insect pests mainly refer to underground pests: the method of applying together with fungicides is generally adopted. Aboveground pests are mainly night moth pests, such as beet armyworm, cotton bollworm, etc., which can be sprayed with pyrethroids pesticides and chlorpyrifos.