1、Nitrogen Nutrition of Fruit Trees to Reconcile Productivity and

Optimisation of the use of external and internal N sources is important for a sustainable fruit production, as N use efficiency by young and mature fruit trees is generally lower than 55% and losses of fertilizer N may occur with the consequent economic and environmental concern.

2、Effects of different rates of nitrogen fertilizer on apple yield, fruit

Collectively, N fertilization slightly affected apple yield and fruit quality but significantly altered soil moisture and NO 3− -N within the 6-m soil profile. An N application rate of 412 kg ha 1 was recommended to support apple production and maintain balanced SWS 6 m and RSN 6 m for rainfed apple orchards on China's Loess Plateau. 1.

3、How Much Fertilizer Do I Need For Fruit Trees

This article provides a comprehensive guide on fertilizer use for fruit trees, focusing on the need for different types of trees and soil conditions. Proper fertilization is crucial for maximizing fruit yield in fruit trees, such as apple trees and other stone fruits.

4、When & How to Fertilize Fruit Trees: Complete Guide

Discover the optimal times to fertilize fruit trees and choose the right fertilizer for robust growth and increased harvest. Get expert guidance now.

Fertilizing Fruit Trees

To ensure healthy foliage, to promote vigor, and to maximize fruit quality, fertilize deciduous fruit trees each growing season, beginning with the second growing season after planting.

How Much Fertilizer Do Fruit Trees Need For Optimal Growth And

Learn how to assess soil health, identify tree-specific needs, and apply fertilizers effectively, whether organic or synthetic. Discover tailored guidelines for various fruit trees, ensuring your garden thrives with every season.

Do Fruit Trees Need Nitrogen? How Much and When?

Trees that grow more than 18” pear year may be receiving too much nitrogen, while trees growing less than 12” per year may be receiving too little. Colorado State University has a quick chart for specific growth rates of common fruit trees.

How To Fertilise Fruit Trees For Maximum Growth And Sweet, Healthy Harvests

Discover the essential nutrients your trees crave, optimal timing for applications, and effective methods to enhance growth and fruit production. Learn the benefits of organic versus synthetic fertilizers and how to tailor your approach for maximum yield and tree health.

Fertilization

Each fertilizer product contains a different amount of nitrogen, so the amount of fertilizer needed depends on its nitrogen content. The amount of fertilizer to add will also vary with tree age and size. The recommended rate in the first few years after planting is ½ ounce nitrogen per tree.

Nitrogen Nutrition of Fruit Trees to Reconcile Productivity and

Juvenile, non-fruiting trees have to be fertilized more frequently than fruit-bearing trees, using smaller amounts of nutrient at each application. The supply must also be targeted to the limited soil volume, where roots are present.

During the fruit-bearing period, fruit trees have a relatively high demand for nitrogen fertilizer. Nitrogen is one of the essential nutrient elements for the growth and development of fruit trees. It promotes plant growth, improves photosynthetic efficiency, enhances flowering and fruit development, and strengthens the tree’s resistance. rational application of nitrogen fertilizer is crucial during the fruit-bearing period.

I. Characteristics of Nitrogen Fertilizer Requirements During the Fruit-Bearing Period

1. High Demand Phase: After entering the fruit-bearing stage, the demand for nitrogen fertilizer gradually increases. This is because the tree requires more energy and nutrients to support fruit development and yield as the fruits mature.

2. High Concentration Requirement: During the fruit-bearing period, a higher concentration of nitrogen fertilizer is needed. High nitrogen levels promote fruit enlargement, coloring, and improve fruit quality. Additionally, they enhance the tree’s disease resistance, reducing the incidence of pests and diseases.

3. Slow-Release and Long-Acting Demand: Due to the extended fruit-bearing period, nitrogen supply must be sustained and stable. This requires fertilizers with good slow-release and long-acting properties to meet the tree’s nutritional needs throughout its growth cycle.

II. Fertilization Principles

1. Balanced Fertilization: During the fruit-bearing period, nitrogen, phosphorus, and potassium should be applied in balanced proportions based on the tree’s growth status and soil conditions.

2. Moderate Application: Avoid overapplication to prevent excessive nitrogen, which can lead to vigorous but poor-quality growth.

3. Phased Application: Adjust fertilization according to different growth stages:

   • Low nitrogen before bud sprouting and during flower bud differentiation to ensure normal shoot growth.
   • High nitrogen during full bloom to support flower development.
   • High phosphorus during fruit enlargement to ensure healthy fruit formation.

III. Fertilization Methods

1. Deep Application: Bury fertilizers deep in the soil for slow release, suitable for organic and slow-release fertilizers.

2. Shallow Application: Scatter fertilizers on the soil surface for quick absorption, ideal for fast-acting fertilizers.

3. Ring Application: Evenly spread fertilizer within the tree’s canopy projection area and dig trenches around the trunk. Suitable for large trees or densely planted orchards.

4. Strip Application: Apply fertilizer along longitudinal trenches under the canopy. Best for medium-small trees or sparsely planted orchards.

5. Spot Application: Directly place fertilizer within the canopy area and compact the soil. Suitable for small trees or highly dense orchards.

IV. Precautions

1. Fertilizer Type Selection: Choose fertilizers based on tree species and soil conditions (e.g., rotted organic fertilizer for apples, high-nitrogen compound fertilizer for citrus).

2. Concentration Control: Maintain optimal nitrogen concentrations (0.2%–0.5%). Excessive nitrogen leads to overgrowth and poor fruit quality, while insufficient levels hinder nutrient uptake.

3. Timing and Method: Apply fertilizer in spring (before budding) and autumn (after leaf fall). Adjust methods based on fertilizer type and tree characteristics.

While fruit-bearing trees require significant nitrogen, scientific management is key. Proper fertilization, concentration control, and tailored application methods ensure healthy tree growth, improved fruit quality, and increased economic benefits.