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In the key apple production areas, 109 soil samples were taken to determine the contents of soil organic matter, hydrolyzable nitrogen, available phosphorus, and available potassium. The contents of available iron, available boron, and available zinc in 30 representative soil samples were also determined. The status of soil nutrients is as follows (refer to the content of various indicators / orchard soil organic matter and nutrient content classification index 0, hereinafter referred to as indicators).
The results of soil nutrient test showed that the available phosphorus content in soil was between 7.0 and 80.4 mg/kg, with an average of 22.4 mg/kg and a coefficient of variation of 42.45. The suitable range for the indicator is 40~50mg/kg, 82 samples below this range, accounting for 75.23% of the total samples. The content of soil available potassium was between 39 and 158 mg/kg, with an average of 90.8 mg/kg and a coefficient of variation of 36.35. The suitable range for the indicator is 100~150mg/kg, and the number of samples below this range is 86, which accounts for 78.90% of the total sample points. It can be seen that the contents of organic matter and nitrogen, phosphorus and potassium in the apple orchard of Heze City are all at a relatively low level.
Based on the results of soil nutrients measured by the Soil Fertility Tester, a fertilization method in accordance with the local soil conditions was proposed. Before and after budding in early spring, 50% of annual nitrogen and 30% of phosphorus were applied. Before flower bud differentiation, 30% of nitrogen and phosphorous and 40% of potassium were applied throughout the year, which has the most obvious effect on increasing yield. Flower bud differentiation is generally in mid-June, and fertilization should be at the end of May or early June. During the fruit enlargement period, 20% of phosphorus and 40% of potassium are applied throughout the year, and nitrogen fertilizer is generally not applied.
Determination of Soil Fertilizer in Heze Apple Orchard by Soil Fertility Differentiation Tester
Apple is grown in Heze, Shandong, and is one of the major tree species in the area. In recent years, combined with the implementation of balanced fertilization projects for agricultural soil testing formulas, a sample analysis of soil nutrient status in apple orchards in Heze City has been conducted, and a fertilization plan has been proposed to guide production. For the implementation of the soil testing formula, the soil nutrient tester must first be used to effectively measure the soil nutrients, so as to formulate the formula fertilizer according to the actual situation.