A kind of special fertilizer for long-acting dry farming sweet potato and preparation method thereof

A sweet potato special fertilizer, long-term technology, applied in the application, fertilization device, fertilizer mixture and other directions, can solve the problems of high price of slow-release long-acting fertilizer, easy loss of ordinary fertilizer, complicated process, etc., to reduce water transpiration and cost. Low, simple preparation process effect

Active Publication Date: 2015-08-19
QINGDAO AGRI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the many defects in the prior art, the purpose of the present invention is to provide a special fertilizer for long-acting dry-farmed sweet potatoes and a preparation method thereof, which can solve the problems of easy loss of common fertilizers and the reduction of fertilizer efficiency caused by water shortage, etc. It can meet the fertilizer needs of sweet potatoes throughout the growth period; and solve the technical problems of the existing slow-release long-acting fertilizers that are expensive and complex in process

Method used

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  • A kind of special fertilizer for long-acting dry farming sweet potato and preparation method thereof
  • A kind of special fertilizer for long-acting dry farming sweet potato and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0019] A special fertilizer for long-acting dry-farmed sweet potatoes, the specific raw materials and preparation method are as follows:

[0020] (1), prefabricated fertilizer core: 200kg of nutrient P 2 o 5 40% powdered heavy superphosphate, 480kg of K 2 Potassium sulfate with an O content of 50%, 55kg of powdered urea, and 25kg of fulvic acid are put into a stirring mixer and mixed evenly.

[0021] The spray granulation process is used for granulation, specifically: the uniformly mixed powdered triple superphosphate, potassium sulfate, powdered urea, and additives are fed into the granulation drum. Melt 100kg of urea, spray it into the fertilizer mixture in the granulation cylinder by spray granulation process, then dry it at 90°C and sieve it into a spherical granular fertilizer core with a particle size of 2.5-3.5mm. The weight ratios of nitrogen fertilizer, phosphorus fertilizer and potassium fertilizer in the fertilizer core calculated by pure nitrogen, phosphorus pen...

Embodiment 2

[0028] The special fertilizer for long-acting dry-farming sweet potato containing trace element zinc can be prepared by the following steps.

[0029] (1) Prefabricated fertilizer core: 50kg powdered urea, 110kg N-P 2 o 5 -K 2 O powdery monoammonium phosphate with a nutrient content of 12-55-0, 480kg of K 2 Potassium sulfate with an O content of 50%, 42kg of zinc sulfate with a zinc content of 24%, and 38kg of fulvic acid are mixed evenly. The above-mentioned fertilizers that have been mixed evenly are sent into the granulation drum.

[0030] Melt 140kg of urea, and use the spray granulation process to spray all the melted 140kg of urea into the fertilizer mixture in the granulation tube, and control to achieve a suitable particle size, which is a special fertilizer for sweet potatoes with a nutrient content of 11.7-7-27.9 (Also contains 1% trace element zinc). The granulation process can also adopt drum steam granulation or disc granulation. In the drying process, the dr...

Embodiment 3

[0036] Under the situation that manufacturing process is identical with embodiment 1 and 2, adjust the kind and proportioning of material, the different fertilizer inner cores of making, as shown in table 1:

[0037] Table 1 Fertilizer core combination ratio selection

[0038]

[0039] The additive 1 is selected from one or more mixtures of fulvic acid, urease inhibitors and light calcium carbonate; the additive 2 is a compound micro-fertilizer selected from zinc sulfate, manganese sulfate, ferrous sulfate and boric acid one or a combination of several.

[0040] On the outside of the fertilizer core, the thickness of the coating coating and the water-retaining agent layer sprayed are different, and the material ratio of the curing agent in the coating coating is different, which can produce special fertilizers with different slow-release time and water retention capacity (see Table 2 ).

[0041] Table 2 Combination ratio selection of coating coating and water-retaining ag...

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Abstract

The invention relates to a long-acting fertilizer specially used for dry-farming sweet potatoes and a preparation method for the long-acting fertilizer. The fertilizer is granular and comprises three layers of structures, namely a fertilizer kernel, a wrapping film coating layer and a water-retaining agent coating layer in sequence from inside to outside. The kernel of the long-acting fertilizer specially used for the dry-farming sweet potatoes contains effective components such as a nitrogen fertilizer, a phosphorus fertilizer, a potassic fertilizer and a composite micro fertilizer which are specially suitable for the sweet potatoes; the wrapping film coating layer controls the speed of water entering a film and controls and regulates release of nutrition; the water-retaining agent coating layer can effectively retain water in soil and rainwater; lateral seepage runoff and water evaporation are alleviated, and front and middle-stage growth of the sweet potatoes is guaranteed. The preparation method for the fertilizer is implemented through one-time spraying; the technically occupied space is small, the equipment investment is small, the preparation process is simple and the energy consumption is low; the wrapping film material is low in cost, so that the price of the fertilizer is greatly reduced.

Description

technical field [0001] The invention relates to the field of crop fertilizers and the preparation of fertilizers, in particular to a special fertilizer for long-acting dry-farmed sweet potatoes and a preparation method thereof. Background technique [0002] In the prior art, the special fertilizer for sweet potato is formed by mixing elemental chemical fertilizers containing nitrogen, phosphorus and potassium and micro-fertilizers according to a certain ratio. Nitrogen fertilizers used in fertilizer materials such as urea, ammonium chloride, ammonium sulfate, ammonium bicarbonate, etc., are prone to ammonia volatilization loss after application on calcareous soil. At the same time, after being converted into nitrate nitrogen by nitrifying bacteria in the soil , it is easier to leaching and loss; and the phosphorus in the fertilizer is also easier to combine with calcium, magnesium, iron and aluminum in the soil to grow insoluble precipitation; potassium is easy to be fixed b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/08C05G3/00C05G3/90
Inventor 史衍玺祝秀芝吴春红杜志勇李欢
Owner QINGDAO AGRI UNIV
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