Waterweed control (hydrodictyon utricnlatum pooth) in rice plantings

FIELD: agriculture.

SUBSTANCE: this method suggests constant 10-12 cm water level during whole growing period up to rice harvesting. Herewith calurea treatment of rice is performed during the 5-6 leafs stage. This invention allows increasing waterweed (Hydrodictyon utricnlatum Pooth.) control efficiency in rice plantings during tillering stage (3-7 leafs).

EFFECT: increase of waterweed control efficiency in rice plantings.

2 tbl


The invention relates to agriculture, in particular to methods of algae control division of Green algae, the class Actually green, about Food, family Hydrogencyanide, type Hydrodictyon mesh or water mesh in the rice fields.

The known method of algae control, including the introduction of copper sulphate at a dose of 2-3 kg/ha (≈2 ml/l) (Agarkov E, Crisco B.A., Sokolov MS and other Chemical control of weeds of rice in wetland area. Krasnodar, 1977, p.37-39).

The disadvantages of this method is the low productivity; the content in the aquatic environment rice cheque carbonates and phosphates, which precipitated copper, increasing the consumption of copper sulphate, which is toxic and is excluded from the list of drugs used in rice.

The known method of algae control in rice cheque, including under-winter plowing with the turnover of the reservoir, and after sowing rice seeds creates a layer of 10-12 cm of water and maintain it until emergence above the water surface (U.S. Pat. No. 2206969, AV 79/02, 01G 16/00, 2003).

The disadvantage of this method is low efficiency of the fight against algae family Hydrocyclonic (water veins), because it is aimed only at combating algae of the order Cladophora.

The known method of algae control, taken as a prototype, including the discharge check with a layer of water the seedling stage 3 leaves and subsequent short-lived (2-3 days) drying soil (Aleshin, H.E., Smetanin A.P., hares and other V.B. have been Methodical instructions on the cultivation of rice. M.: Kolos, 1979, p.48).

The disadvantage of this method is low efficiency of the fight against algae family Hydrocyclonic (water mesh), because in June at the age of rice 3-4 leaves spend nitrogen fertilizer, and this type of algae refers to azotoluene forms. By this time, it forms a large biomass and the water discharge forms a dense film covering the seedlings of rice, which leads to their death, thereby isergiwa crops and reducing the harvest.

The objective of the invention is improving the effectiveness of anti-malware as algae of the order Hydrocyclonic (water mesh) on the rice crops in the seedling stage-tillering (3-7 leaves).

This object is achieved in that during the emergence of the water mesh in check is set to a constant layer of water 10-12 cm and supported the entire growing season of rice before harvest. The first feeding of rice plants with nitrogen is carried out in the phase of 5-6 leaves. Important before feeding to allow plants to Mature, the upper leaves (5 and 6-mu) to break away from the surface of the water. This allows the rice plants to be in the top tier, above the seaweed that after nitrogen fertilization is actively growing, water occupying the space. More than a layer of water on the check, the more is formed biomass is grown, inhibiting the growth and development of rice plants.

Production testing of the method of algae control Water mesh in rice crops conducted in the rice fields of the collective farm "Kuban" Abinsk district of Krasnodar region on the area of 12.4 ha in 2003 on crops of rice varieties estuary.

The fertilizer system in this area consisted of making a basic fertilizer N100P120K90before planting with incorporation into the soil to a depth of 0,12 0,1...m

Of phosphate fertilizers used double superphosphate at the rate of 120 kg/ha according to the current matter. Of potash fertilizers - 40%potassium salt with a rate of 90 kg/ha of active substance.

Phosphorus-potassium fertilizers were applied on April 27, drill PTT-4,2.

Nitrogen fertilizer was made urea in the amount of 150 kg/ha of active substance, including: 100 kg/ha as the main fertilizer for 4 days before sowing (may 8), and 50 kg/ha of active ingredient in the dressing (see technology of rice cultivation (HOWTO. Aleshin, H.E., etc. M.: Kolos, 1983, p.34-35).

Sowing of rice varieties estuary held on may 12 and may 13, flooded cheque layer of water 10-12 see Nitrogen fertilizer conducted urea 25 June, when the rice plants have reached the age of 5-6 leaves with a rate of 50 kg/ha of active substance. After feeding and before discharge of the water before the harvest (August 28) supported on the check sheet of water 10-12 with whom.

Comparative evaluation of the actions of the way to fight algae water fishnet prototype and the proposed method are presented in table (tillering stage of rice - 8 leaves).

OptionsThe stand density

plants of rice, PCs/m2

Yield increase
1. Water discharge and short dryingof 83.4of 31.8--
2. The proposed method of algae control Water fishnet171,654,022,261,8

The proposed method of algae control Water mesh in rice crops allows to minimize the loss of rice plants (51.4%) and to increase the yield of 22.2 kg/ha, i.e. by 69.8%.

Comparative analysis of the characteristics of novelty
The placeholderThe proposed method
1. Reset check with a layer of water in the seedling stage 3 leafNo
2. Short (2-3 days) drying of the soilNo
3. NoSet postojannykh 10-12 cm of water clean up
4. Conducting nitrogen fertilization with urea at the rate of 50 kg/ha A.I in the stage of 3-4 leavesConducting nitrogen fertilization with urea at the rate of 50 kg/ha A.I in the phase of 5-6 leaves

The way to combat algae water mesh in rice crops, including nitrogen fertilizer in the phase of 5-6 leaves, wherein the pre-set constant layer of water 10-12 cm and supported the entire growing season of rice before harvest.


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2 tbl, 2 ex

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