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Long-acting fertilizer specially used for dry-farming sweet potatoes and preparation method for long-acting fertilizer

A special sweet potato fertilizer and long-acting technology, which is applied in application, fertilization equipment, fertilizer mixture, etc., can solve the problems of expensive slow-release long-acting fertilizer, easy loss of common fertilizer, and complicated process, so as to reduce water transpiration and cost The effect of low cost and simple preparation process

Active Publication Date: 2014-05-07
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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  • Long-acting fertilizer specially used for dry-farming sweet potatoes and preparation method for long-acting fertilizer
  • Long-acting fertilizer specially used for dry-farming sweet potatoes and preparation method for long-acting fertilizer

Examples

Experimental program
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Effect test

Embodiment 1

[0019] A special fertilizer for long-term dry farming sweet potato, the specific raw materials and the preparation method are as follows:

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

[0021] Use the spray granulation process to granulate, specifically: feeding the mixed powdery superphosphate, potassium sulfate, powdery urea and additives into the granulation drum. Melt 100kg of urea, spray it into the fertilizer mixture in the granulation cylinder by using the spray granulation process, then dry it at 90°C and sieve it into spherical granular fertilizer kernels with a particle size of 2.5-3.5mm. Among them, the weight ratio of nitrogen fertilizer, phosphorus fertilizer and potassium fertilizer in the fertilizer kernel calculated by pure nitrogen, phosphorus pento...

Embodiment 2

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

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

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

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 preparation of crop fertilizers and fertilizers, in particular to a special fertilizer for long-term dry farming sweet potato and a preparation method thereof. Background technique [0002] In the prior art, the special fertilizer for sweet potato is made by mixing elemental chemical fertilizer containing nitrogen, phosphorus and potassium and micro-fertilizer according to a certain proportion. The nitrogen fertilizers in the fertilizer raw materials used, such as urea, ammonium chloride, ammonium sulfate, ammonium bicarbonate, etc., are easy to produce ammonia volatilization loss after application on calcareous soil. , it is more prone to leaching and loss; and the phosphorus in the fertilizer is also easier to combine with the calcium, magnesium, iron and aluminum in the soil to form insoluble precipitation; potassium is easily fixed by 2:1 type clay minerals; not only leads to the utilization of fertilizers The...

Claims

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Application Information

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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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