Time and method of fertilization for pomegranate trees

Basal fertilizer: pomegranate trees are usually applied with basal fertilizer before freezing in autumn or after thawing in early spring, and autumn basal fertilizer needs to be applied immediately after fruit picking. Topdressing: pre-flowering and post-flowering need topdressing, pre-flowering fertilizer and post-flowering fertilizer are complementary. Fruit expansion fertilizer: nitrogen and phosphorus quick-acting fertilizer can be applied from the end of June to the beginning of July, and appropriate potassium fertilizer can be matched. Fertilization methods: including ring fertilization, radial furrow fertilization, hole fertilization, strip furrow fertilization, whole garden fertilization, irrigation and distribution fertilization methods.

1. Fertilization time of pomegranate trees

1. Base fertilizer

Generally in the autumn before freezing or early spring soil thaw into the base fertilizer, the main base fertilizer has a variety of organic matter fertilizer and calcium superphosphate, bone late-acting fertilizer. Autumn base fertilizer is generally applied immediately after fruit picking, which is conducive to strengthening tree vigor and improving fruit setting rate in the coming year, thus increasing yield.

2. Topdressing before flowering

Pomegranates need more nutrients for germination and flowering. Available nitrogen, phosphorus and potassium can be applied to meet the needs of flowering and fruit setting, which is conducive to increasing the number of flowering and improving the fruit setting rate.

3. Topdressing after flowering

The young fruit of pomegranate grows faster, and the new tip is also accelerating its growth. At this time, nitrogen fertilizer can be applied reasonably, which is conducive to promoting the growth of the new tip and reducing the physiological fruit drop rate. The fertilizer before flowering and the fertilizer after flowering are complementary. If sufficient fertilizer is applied before flowering, no fertilizer can be applied after flowering.

4. Fruit expansion and topdressing

When most flowers wither and young fruits expand from the end of June to the beginning of July, nitrogen and phosphorus quick-acting fertilizers can be applied together with appropriate potassium fertilizer, which is beneficial to reduce young fruit shedding, thereby promoting fruit expansion and improving yield.

2. Fertilization method of pomegranate tree

1. Circular ditch fertilization

This method is suitable for pomegranate orchard on flat land. A circular ditch with width of about 50cm and depth of about 25-40cm is dug outside the tree crown, and then fertilizer and topsoil are mixed evenly and applied to the covering soil. Often used for young trees, its characteristics are easy to operate, economic fertilizer, but the fertilization range is relatively small, and it is easy to cut off the horizontal roots by digging trenches.

2. Radial groove fertilization

4-8 furrows shallow inside and deep outside are dug outward at the place about 1m away from the trunk, the width of the furrows is 30-50 cm, and the depth is 15-30cm. The soil and fertilizer are mixed evenly and then applied. The method is suitable for topdressing in full fruit stage and fruit tree growth season. The characteristics of the method are less root injury and wider fertilizer application area, which is beneficial to promoting root absorption.

3. Hole fertilization

Fertilization is carried out by digging fertilizer holes 1m outside the trunk, which is generally used for topdressing in the growth period of fruit trees.

4. Furrow fertilization

The method can be combined with autumn ploughing, generally in the rows and plants or alternate rows of furrow fertilization, the method is similar to the ring furrow fertilization method, commonly used with young trees deep ploughing garden and wide row dense planting garden autumn fertilization.

5. Fertilization of the whole garden

First of all, the fertilizer will be evenly spread throughout the garden, and then turned into the soil, the depth of about 20cm, generally suitable for adult trees and densely planted orchard fertilization. Its characteristics of fertilizer application area is wide, conducive to root absorption, but long-term use will reduce stress resistance, can be mixed with radial ditch fertilization method, conducive to the maximum fertilizer efficiency.

6. Irrigation and fertilization

Generally used for adult orchards or densely planted orchards, dry farming area fertilization, in fact, irrigation and fertilization combined, its characteristics do not hurt roots, save time and effort, fertilizer utilization rate is high.