Spinach high yield fertilization technology

The root system of spinach is very developed, with a distribution range of up to 1 cubic meter. It is suitable for sandy loam soil rich in organic matter. Neutral soil with pH 6.3-7.0 is suitable. Acidic pH less than 5.5 will affect germination and even death. Spinach is a wet crop and soil moisture exceeds More than 20% will produce wet roots and death. Spinach Fertilization Technology Spinach is divided into winter spinach, spring spinach and autumn spinach according to different production seasons. Spinach should be fully watered before planting to ensure that the seedlings and seedlings are no longer watered, and the germination is not carried out until 3 to 4 leaves. In order to prevent the occurrence of blight, it is necessary to control the watering. The amount of water needed in the middle and late growth period is increased. Generally, it needs to be watered for 3 to 5 times to keep the soil moist. The wintering spinach is poured into the “frozen water” before winter. Winter spinach is sown at the end of the first year of the year, harvested in the spring of the next year, and long periods of dormancy are required in winter. Therefore, it is especially necessary to pay attention to the fertilization of winter spinach. Spinach fertilization is divided into two types: base fertilizer and topdressing:

First, apply enough base fertilizer

Autumn spinach applies 4000-5000 kg of organic fertilizer per acre, 25-30 kg of superphosphate, 20-25 cm deep, and is made of sorghum or sorghum. Overwintering spinach chooses soil with deep soil layer, fertile soil, high humus content, good fertilizer and water storage capacity, and should apply more organic fertilizer than other seasons. It can apply 5,000 kg of decomposed organic fertilizer per acre, superphosphate 25-30 Kg, deep turn 20-25 cm, so that the soil and fertilizer fully mixed, loose soil, promote seedling emergence and root development, adequate base fertilizer, seedling growth and robust, is the key to safe wintering of vegetables. Spring spinach sowing early, can be fertilized in the whole year, 4000-5000 kg of organic fertilizer per mu, 20-25 cm deep, sputum sputum, when the early spring soil is frozen 7-10 cm deep can be sown. It is advisable to choose neutral mucoid soil, and it can be applied as a base fertilizer by using a mixture of compost and fertilizer. Composting 3000-4000 kg per mu, 30-35 kg of superphosphate, 20-25 kg of ammonium sulfate, 10-15 kg of potassium sulfate, 20-25 cm deep, and sputum.

Second, timely topdressing

After the autumn spinach seedlings are unearthed, when they grow to 4-5 true leaves, they should be applied 2-3 times of quick-acting nitrogen fertilizer in stages. 20-25 kg of ammonium sulfate per hectare, or 10-12 kg of urea, promote thickening of leaves, increase yield and improve quality.

Wintering spinach requires long periods of dormancy in winter, so pay attention to fertilization. The production of 1 000 kg of spinach requires 1.6 kg of pure nitrogen, 0.83 kg of phosphorus pentoxide and 1.8 kg of potassium oxide. Before wintering, the spinach seedlings are about 10cm high. According to the growth situation, the wintering fertilizer should be applied once, and 10 to 15 kg of nitrogen fertilizer and 10 to 15 kg of phosphate fertilizer should be applied. Be sure to pour frozen water one time before wintering to prevent dead seedlings in winter. In the spring of the next year, it should be topdressed in time, and can apply 20 to 25 kg of nitrogen fertilizer and 15 to 20 kg of phosphorus and potassium fertilizer. Foliar application can also be carried out with 0.3% foliar fertilizer. In the early spring, the growth period is 30-40 days. When the spinach leaves are green, the heart leaves begin to grow, and the small water can be poured once. After the spinach enters the vigorous growth period, it should be topdressed in time, combined with watering 10-15 kg of ammonium sulfate per acre. In this period, sufficient fertilizer and water supply can be provided, which can delay convulsions, increase production and improve quality.

In the early stage of growth, spring spinach generally does not need to fertilize water to facilitate the absorption of nutrients in the soil. In the middle and late stages of fertility, the amount of absorbed fertilizer and water will increase, and 15-20 kg of ammonium sulfate can be applied per acre. Due to the short growth period of spring spinach, sufficient nitrogen fertilizer can make the leaves grow vigorously and delay the convulsion period. Summer spinach is being planted in the high temperature season. After 2-3 pieces of true leaves appear, chasing 1-2 times of available nitrogen fertilizer, 10-15 kg of ammonium sulfate per acre.

Spinach topdressing should not spread the fertilizer in the heart leaves, so as not to cause burning seedlings, each time the topdressing should be combined with watering, so that the fertilizer can play a role as soon as possible, spinach to achieve high yield and high efficiency.

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