1、Application of Bioorganic Fertilizer Significantly Increased Apple Yields and Shaped Bacterial Community Structure in Orchard Soil

The experiment includes three treatments: (1) control without fertilization (CK); (2) application of chemical fertilizer (CF); and (3) application of bioorganic fertilizer and organic-inorganic mixed fertilizer (BOF).

2、Interactive effects of organic fertilizer, CaSO4 and amino acid Ca on Fuji apple in Burozem soil in China

A two-year trial was conducted to test the interactive effects of special-for-apple organic fertilizer, CaSO 4, and amino acid Ca on Fuji/Balenghaitang (Malus robusta Rehd.) rootstock in Burozem soil in China.

3、Towards sustainable intensification of apple production in China — Yield gaps and nutrient use efficiency in apple farming systems

There is an urgent need to enhance apple productivity and improve nutrient use efficiencies in intensive apple production systems in the country. These can be attained by improved understanding of production potential, yield gaps, nutrient use and best management in apple orchards.

Effects of chemical fertilizer combined with organic manure on Fuji apple quality, yield and soil fertility in apple orchard on the Loess Plateau of China

To evaluate the effects of chemical fertilizer combined with organic manure on apple yield, quality and soil fertility, an experiment was conducted in an apple orchard on the Loess Plateau of China.

EFFECT OF ORGANIC FERTILIZERS AND SOIL CONDITIONERS ON THE QUALITY OF MAIDEN APPLE TREES

These treatments were compared with standard fertilizers used in organic (granulated bovine manure) and conventional (chemical fertilization (NPK)) production and an unfertilized control.

The Role of Biofertilization in Improving Apple Productivity―A Review

It was concluded that the single application of Tytanit® in the organic nursery seemed to be sufficient treatment for improving the quality of maiden apple trees.

Trench layering using indole

This study determined the effect of organic substrate mixtures (OSM) and indole-3-butyric acid (IBA) on rooting, sprouting and survival characteristics of apple rootstocks propagated by trench layering.

Effect of composted manure plus chemical fertilizer application on aridity response and productivity of apple trees on the loess plateau, China

The aim of the present study was to investigate the effects of composted manure (CM) plus chemical fertilizer (CF) applications on the aridity response and yield of apple trees.

Fertilizing Fruit Trees

In the backyard orchard, proper pruning in addition to the application of nitrogen in the spring prior to or at bud break helps maintain this productive status. Other than nitrogen and zinc, iron and manganese may limit growth due to our alkaline soil conditions.

VEGETATIVE AND PRODUCTIVE RESPONSES OF ORGANIC APPLE (Malus domestica L.) TO FOSSILIZED RED GUANO AND A CONTROLLED

In many cases, growers tend to apply high amounts of organic N sources in organic apple production in order to supply adequate nitrogen to meet the needs of apple trees.

The methods for treating organic fertilizer during apple tree rooting are as follows:

1. Select Organic Fertilizer: Organic fertilizer is made from animal manure, plant residues, agricultural byproducts, and other materials through fermentation and decomposition. It contains various nutrients, such as nitrogen, phosphorus, potassium, calcium, magnesium, and sulfur, providing essential nourishment for apple tree growth. Common types include compost, green manure, chicken manure, cow dung, pig manure, and fish pond mud.

2. Fermentation of Organic Fertilizer: Stack the organic material, add water to maintain proper humidity, and allow it to ferment thoroughly. During fermentation, organic matter breaks down into simpler compounds, generating heat that raises soil temperature. Fermented fertilizer is more easily absorbed by the soil, enhancing its fertility.

3. Dilute the Fertilizer: Mix the fermented organic fertilizer with water at a suitable ratio to achieve a concentration beneficial for apple trees. Typically, dilute the fertilizer to about 10 times its original weight.

4. Application of Organic Fertilizer: Spread the diluted fertilizer evenly around the apple tree’s root zone or apply directly near the roots. This improves soil water retention and aeration, promotes root development, and strengthens disease resistance.

5. Timing of Fertilization: Apple tree rooting occurs primarily in spring, making this an ideal time to encourage root growth. Autumn is also critical for fertilization, supporting fruit maturation and quality. Winter and early spring require reduced application.

6. Fertilization Methods: Apply organic fertilizer via trench, hole, or ring methods:

   • Trench Application: Spread fertilizer evenly within the tree’s canopy area, then deep-till the soil for thorough mixing.
   • Hole Application: Apply fertilizer directly near roots and cover with soil.
   • Ring Fertilization: Spread fertilizer outside the canopy and dig a circular trench around the trunk to pour in the fertilizer.

7. Fertilization Dosage: Adjust the amount based on tree growth and soil fertility. Generally, apply 2–3 tons per mu (0.066 hectares) of apple orchard. Modify dosage as needed.

8. Fertilization Frequency: Fertilize regularly during rooting periods, typically 2–3 times annually. Spring applications promote root growth, while autumn applications enhance fruit quality.

9. Precautions:

   • Avoid direct contact between fertilizer and roots to prevent burning.
   • Ensure even distribution to avoid over-concentration and soil salinization.
   • Do not apply fertilizer during rainy weather to prevent runoff or surface loss.

By following these steps, organic fertilizer can be effectively managed to provide ample nutrients for apple tree rooting, ensuring healthy growth.