Chitosan and sulfur coated special controlled-release fertilizer for wheat and preparation method thereof

Abstract

The invention discloses a chitosan and sulfur coated special sustained-release fertilizer for wheat and a preparation method thereof, which belong to the technical field of controlled-release fertilizer. The fertilizer is based on the nutrient absorption law of wheat. The fertilizer is obtained by preparing 5-percent chitosan coated urea, 6-percent chitosan coated urine, sulfur coated urine, monoammonium phosphate, potassium chloride, humic acid and ethylene diamine tetraacetic acid (EDTA) chelate iron according to a specified mixing ratio, fully mixing, weighing and packaging. The special controlled-release fertilizer has the advantages of high nutrient utilization rate, environment pollution reduction due to degradability of the coating of the fertilizer, low price, consistence between nutrient release and wheat absorption law, labor cost conservation and improvement on quality of wheat.

Description

technical field

[0001] The invention relates to the technical field of slow and controlled release fertilizers, in particular to a special controlled release fertilizer for wheat and a preparation method thereof. Background technique

[0002] Wheat is one of the most important food crops for human beings, and is the staple food of 1 / 3 of the world's population. In my country, wheat is the second largest food crop after rice, and its planting area and total output rank first in the world. Wheat is usually sown in mid-to-early October and has a long growth period, generally taking 210-220 days from sowing to maturity. Wheat is a crop that requires a lot of fertilizer. Under normal cultivation conditions, for every 100kg of wheat grain produced, it needs to absorb about 3kg of nitrogen, 1-1.5kg of phosphorus pentoxide, and about 3kg of potassium oxide from the soil. The ratio of , phosphorus and potassium is about 1:0.33:1.

[0003] According to the existing fertilizer vari...

Examples

Embodiment 1

[0061] Example 1: Preparation of chitosan, special controlled-release fertilizer for sulfur-coated wheat, nitrogen, phosphorus and potassium (N-P 2 o 5 -K 2 O) content is respectively 18%, 18%, 18%, all are percentage by mass, and total nutrient is greater than 54%, and raw material composition is as follows:

[0062] 5% chitosan-coated urea 85kg, 6% chitosan-coated urea 100kg, sulfur-coated urea 185kg, monoammonium phosphate 295kg, potassium chloride 300kg, humic acid 30kg, EDTA chelated iron 5kg;

[0063] Put all the above-mentioned raw materials together in a blender and stir for 8 minutes, fully mix them, then measure and pack them.

Embodiment 2

[0064] Example 2: Preparation of chitosan, special controlled-release fertilizer for sulfur-coated wheat, nitrogen, phosphorus and potassium (N-P 2 o 5 -K 2 O) content is 20%, 26%, 8% respectively, all are percentages by mass, the total nutrient is greater than 54%, and the raw material components are as follows:

[0065] 5% chitosan-coated urea 80kg, 6% chitosan-coated urea 100kg, sulfur-coated urea 200kg, monoammonium phosphate 425kg, potassium chloride 135kg, humic acid 55kg, EDTA chelated iron 5kg;

[0066] Put the above-mentioned raw materials together in a blender and stir for 9 minutes, fully mix them, then measure and pack them.

technical field

[0001] The invention relates to the technical field of slow and controlled release fertilizers, in particular to a special controlled release fertilizer for wheat and a preparation method thereof. Background technique

[0002] Wheat is one of the most important food crops for human beings, and is the staple food of 1 / 3 of the world's population. In my country, wheat is the second largest food crop after rice, and its planting area and total output rank first in the world. Wheat is usually sown in mid-to-early October and has a long growth period, generally taking 210-220 days from sowing to maturity. Wheat is a crop that requires a lot of fertilizer. Under normal cultivation conditions, for every 100kg of wheat grain produced, it needs to absorb about 3kg of nitrogen, 1-1.5kg of phosphorus pentoxide, and about 3kg of potassium oxide from the soil. The ratio of , phosphorus and potassium is about 1:0.33:1.

[0003] According to the existing fertilizer vari...

Examples

Embodiment 1

[0061] Example 1: Preparation of chitosan, special controlled-release fertilizer for sulfur-coated wheat, nitrogen, phosphorus and potassium (N-P 2 o 5 -K 2 O) content is respectively 18%, 18%, 18%, all are percentage by mass, and total nutrient is greater than 54%, and raw material composition is as follows:

[0062] 5% chitosan-coated urea 85kg, 6% chitosan-coated urea 100kg, sulfur-coated urea 185kg, monoammonium phosphate 295kg, potassium chloride 300kg, humic acid 30kg, EDTA chelated iron 5kg;

[0063] Put all the above-mentioned raw materials together in a blender and stir for 8 minutes, fully mix them, then measure and pack them.

Embodiment 2

[0064] Example 2: Preparation of chitosan, special controlled-release fertilizer for sulfur-coated wheat, nitrogen, phosphorus and potassium (N-P 2 o 5 -K 2 O) content is 20%, 26%, 8% respectively, all are percentages by mass, the total nutrient is greater than 54%, and the raw material components are as follows:

[0065] 5% chitosan-coated urea 80kg, 6% chitosan-coated urea 100kg, sulfur-coated urea 200kg, monoammonium phosphate 425kg, potassium chloride 135kg, humic acid 55kg, EDTA chelated iron 5kg;

[0066] Put the above-mentioned raw materials together in a blender and stir for 9 minutes, fully mix them, then measure and pack them.