Do not flush the four fertilizers

The type of fertilizer that is properly selected for fertilization is only water-soluble fertilizer that can be applied with water. Urea, ammonia, ammonium sulfate and ammonium nitrate are commonly used in nitrogenous fertilizers; potassium and potassium sulfates are used in potash fertilizers, and potassium nitrate can also be used. Even phosphorus-containing ammonium phosphate and diammonium phosphate do not need to be flushed. Because the phosphate fertilizer has poor mobility after being dissolved, it is easily fixed and cannot infiltrate into the root layer with water. The best application method of phosphate fertilizer can only be layered buried in the soil in order to improve its utilization.

The single nutrient amount of fertilizing and fertilizing must be streamlined. The amount of pure nitrogen should be controlled at 2~3 kg/mu in the cultivation of high-yielding vegetables, especially the nitrate nitrogen should be controlled below 2~3 kg/mu, with a limited number of times. The amount of potassium fertilizer (potassium oxide) is generally between 2 and 4 kg/mu; otherwise, nutrient waste and losses are large. It will not only reduce the nitrogen fertilizer utilization but also cause pollution to water quality. Fertilization in the whole growth period is generally 2 times.

The period of fertigation is during the period of large crop growth if the vegetables are harvested after fruiting and picking the fruits. If the cabbage is in the filling phase, in the autumn planting, the temperature is decreased and the soil mineralization is decreased. Vegetable crops are also suitable for a large number of growing seasons.

The amount of irrigation water is controlled under the flood irrigation method to prevent flood irrigation, and when the canal irrigation, the depth of the ditch is suitable for the amount of water, so as to prevent the nutrients dissolved in the water from being lost to the water.

Many farmers like to use this top-dressing method and it is effective to use it. However, in order to pursue the effect of the surface, regardless of the cost, one-sided use of large amounts of nitrogen fertilizer, misuse of fertilization, will lead to vegetables, longevity, quality, fertilizer use efficiency, loss of nitrogen, increase soil salinization.

Some people break down granular high-concentration compound fertilizers and crush them; others use unprocessed and insoluble solid organic fertilizers or microbial preparations as fertilizers. These are not appropriate.

In short, we must master the following points in principle:

The method of fertilization should be applied in a timely and appropriate manner. It is mainly used for top dressing in intensive vegetable cultivation, and nitrogen and potassium are mainly applied.

There are four types of fertilizers that do not require flushing, one that does not flush phosphorus, two that do not flush granular compound fertilizers, three that do not flush solid organic fertilizers, and four that do not crush microbial preparations or fertilizers.

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Product Model:



±1.5mm (0.06 inch)

Measuring Unit:


Measuring Range:

0.03~40m (0.01 to 131 ft)

Measuring Time:

0.1~4 seconds

Laser Class:

Class II

Laser Type:

635nm, <1mW

Waterproof & Dustproof :


Auto Laser Off:

60 seconds

Automatic Power-off:

480 seconds(8 minutes)


white LED

Datum Option:

Can choose Front edge or end piece edge as datum

Battery Status:


Signal Strength Display:


LCD display:

2 inch large screen

Display illumination and multi-line display:

Max 2 displays

Data Memory:

Y (allow 20 values)

Backlight display:


Continuous Measurement:


Min/max Measurement:




Area/Volume/Pythagoras Measurement:


Battery Type:

AAA alkaline battery(2*1.5v )


about 80g



Auto correction and error report technology:


Operating Temperature:

0-40 ℃(32-104 ℉ )

Storage Temperature:

-20~60 ℃ (-4~140 ℉)

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Chengdu JRT Meter Technology Co., Ltd ,