CN1149923C - Chemical herbicide for dry rice field and its application method - Google Patents

Abstract

The present invention relates to a chemical herbicide for dry rice fields after seedling emergence and an application method thereof. The chemical herbicide for each hectare contains (by weight) 2.0 to 3.0kg of butachlor emulsifiable concentrate, 7.5 to 11.5kg of 20% propanil emulsifiable concentrate (or 0.1 to 0.6kg of wettable powder containing 50% of quinclorac) and 0.225 to 0.75kg of 56% tetrahydrogen sodium salt (or 0.6 to 1.8kg of water solution containing 20% of methoxone sodium salt). The application method comprises the following steps: evenly mixing 800 to 1000 kg/hectare of clear water with the chemical herbicide, and evenly spraying the mixture on weed stalks and leaves in fields and bare fields after seedling emergence in a non-rainy day. The chemical herbicide has the advantages of low cost, favorable herbicidal effect, no time limitation and no side effect.

Description

Chemical herbicide for dry rice field agent and application process thereof

The present invention relates to prevent and treat dryland paddy weeds in field control technology, specifically a kind of chemical herbicide for dry rice field agent and application process thereof.

In the prior art, upland rice also cries dryland rice, adopts following technology prevention weeds in field; 1. prevent and kill off weeds in field with Stam F-34, better to the grassy weed effect, preventive effect can reach 84%, but is 73% to other section's weed control efficacy; 2. can prevent and kill off 84% to grassy weed, can prevent and kill off 78% with 20% Stam F-34 9L/ hectare+50% benthiocarb 7.5L/ hectare broadleaf weed; 3. use 20% methoxone aqua 1.65L/ hectare+50% benthiocarb missible oil 7.5L/ hectare, can prevent and kill off 63% grassy weed, 52% broadleaf weed; 4. 20% methoxone aqua 1.65L/ hectare+25% Lonster missible oil 2.25L/ hectare can be prevented and kill off 90% grassy weed, 78% broadleaf weed, but rice seedling is had poisoning; 5. use 20% Stam F-34 18.75L/ hectare+20% methoxone aqua 1.65L/ hectare, can prevent and kill off 90%, broadleaf weed is prevented and kill off 90% grassy weed.More than all undesirable to the preventive effect of weeds, and the method that has exerts an influence to rice leaf, tiller number etc., even poisons.Other has Chinese patent (patent No. is 96102448.8) name to be called " herbicides for use in paddy and method for making ", 20% Stam F-34 missible oil that its herbicides for use in paddy method for making is used and 56% mcpa sodium and urea are used with, exist deficiency to be: 1. this prescription because of no bud before the weeding pesticide composition, so can not control the weeds in field that upland rice emerges and do not sprout or sprouting as yet in the dryland paddy of back, according to investigations, this part weeds accounts for 10～20% of the total weeds quantity in rice field, and this part weeds and rice strain contention nutrition, untimely control has a strong impact on rice yield, so can not eradicate the ecotope that all weeds in the dryland paddy are improved rice strain growth by once spraying medicine, it can only catch and kill the weeds in paddy field of having emerged, killing rate is 99%, upland rice emerges the field, back to sprouting or the not unable control of weeds of sprouting as yet, so total preventive effect has only 80～90%, as want to reach and catch and kill the dryland paddy weeds comprehensively and must repeatedly spray medicine, so not only increase drug cost but also increased labour cost; In addition, after weeds emerged, grassy weed was about 3 leaves, dicotyledonous and sedge weed preventive effect before about 5 leaves is best, owing to its 56% mcpa sodium ratio is too high, a little less than seedling, seedling 5 leaves are before the phase, the dispenser rice seedling easily was completely cured when temperature was lower than 15 ℃, influenced rice strain normal development; 2. this prescription can not can both be used at any time, tillers because of influencing upland rice, and the weeding of can only tagging after weeds in paddy field is emerged is in upland rice late tillering state dispenser; 3. influence paddy rice effective tiller number, reason is the effective ingredient 20%3 in the mixture, the ratio of the Stam F-34 missible oil of 4-two chloro propionyl polyaniline and 56%2-methyl-4-chlorophenoxyacetic acid sodium is too small, make that the consumption of 56%2-methyl-4-chlorophenoxyacetic acid sodium is excessive in prescription, thereby influencing upland rice tillers, a large amount of chlorions is accumulated in plant, soil, so that influence rice yield and environment; 4. owing to having only two kinds of pharmacy mix not have other substitute in the prescription, lacking or do not having the next application of any situation in these two kinds of medicaments to be restricted; 5. the complexing agent of these two kinds of mixtures can not be done the preceding soil treatment of bud, otherwise rice seedling is produced harm.

In order to overcome above-mentioned deficiency, the invention provides a kind of cost is low, preventive effect good, be not subjected to time restriction, have no side effect chemical herbicide for dry rice field agent and application process thereof.

The present invention seeks to realize like this: comprise Stam F-34 missible oil and mcpa sodium, it is characterized in that: form prescription by containing 60% butachlor ec, 2.0～3.0kg/ hectare, contain 20% Stam F-34 missible oil 7.5～11.5kg/ hectare and containing 56% mcpa sodium, 0.225～0.75kg/ hectare by heavy;

Described available 50% quinclorac wetting powder, the 0.1～0.6kg/ hectare that contains of 20% Stam F-34 missible oil, 7.5～11.25kg/ hectare that contains substitutes, and described available 20% mcpa sodium aqua, the 0.6～1.8kg/ hectare that contains of 56% mcpa sodium, 0.225～0.75kg/ hectare that contains substitutes;

Application process is by weight above-mentioned prescription to be added clear water 800～1000kg/ hectare fully to mix: after upland rice emerges, adopt spray pesticide method even spraying on weeds in field cauline leaf and exposed ground in the no rainy day.

The present invention has following advantage:

1. the present invention has no side effect.When dispenser, the consumption of 56% mcpa sodium is very low, does not influence paddy rice and normally tillers, and makes chlorion accumulate minimizing in plant, soil, and rice quality and environment are not had influence.

2. the present invention is not limited by time of application.It can be after weeds in paddy field be emerged any time dispenser, having broken other prescription that contains the mcpa sodium composition can only be in the time restriction of rice strain late tillering state dispenser, to adopting different amounts different careless ages, the rice strain is not had any harmful effect, oppose that mutually paddy rice can play certain strong stalk, anti-effect.

3. the present invention prevents and kill off the efficient height.Adopt butachlor to do one of main composition in the present technique prescription, thoroughly having solved in the art methods influence rice strain and grows dryland paddy weeding middle and later periods of not growing thoroughly and in the rice field, make rice field deterioration of the ecological environment problem, make dryland paddy field weeding total effective rate reach more than 99.8%, there are not weeds propagation and widespread and survival evenly and comprehensively spraying under the medicine coverage condition field, the present invention once implements to prevent and treat upland rice whole growing weeds in field, reduced cost thereby repeatedly spray the medicine ratio, and reduced labour intensity with other prescription; The present invention is equally applicable to stalk leaf weedicide behind the paddy field seedling, and insect killing effect can reach more than 99%.

4. the present invention has interchangeability flexibly.Several compositions in preventing and kill off prescription can substitute with the different dosage form of different weed killer herbicides or same weed killer herbicide and the commodity preparation of different content, and promptly the interchangeability of raw material is strong, and raw material is easy to get, and be convenient to use, and effect is the same; In addition, the dosage amplitude broad in this prescription, wide adaptability can be grown different times and differing texture soil adjusting formulation rate according to weeds.

5. operation is convenient in the present invention.The field operating technology is less demanding, needs only to convert according to quantity, evenly sprays to get final product.

Below in conjunction with embodiment the present invention is described in further detail.

Embodiment 1

Fully mix with 60% butachlor 3.0kg/ hectare, 20% Stam F-34 missible oil 11.25kg/ hectare and 56% mcpa sodium wetting powder 0.75kg/ hectare, convert clear water 900kg/ hectare in 5～6 leaf phases of dryland paddy barnyard grass grass, at no rainy day gas, even spraying is on the exposed soil in dryland paddy weeds in field stem, leaf and field.Through observing: grass family and other section's grass cutting blade flavescence after 12 hours, dehydration, weeds in field dehydration in blocks is withered after 2～3 days, then all grass cutting blade canes were all withered dead from the point to the root in 5～7 days, the field does not have weeds and grows in 40 days, kill and control rate reaches more than 99.5%, do not influence the rice strain and tiller, make on the contrary that the thick shape of rice strain stalk is anti-to fall.

Embodiment 2

Fully mix with 60% butachlor 2.0kg/ hectare, 50% quinclorac wetting powder 0.1kg/ hectare and 56% mcpa sodium pulvis 0.225kg/ hectare, convert water 800kg/ hectare, dryland paddy barnyard grass grass 2 leaves wholeheartedly or 3 leaf phases, on the ground that no rainy day gas even spraying is exposed in the cauline leaf and the field of dryland paddy weeds in field.Through observing: grass family and other section's grass cutting blade flavescence after 12 hours, the field is withered with the weeds dehydration after 2～3 days, all weeds in field stems, leaf all dried up dead from the point to the root in 4～6 days, and the field does not have weeds regeneration in 40 days, kill and total control rate reaches more than 99.5%, to the rice strain did not influence of tillering, and there is the rice of impelling strain stalk to increase the thick anti-effect of falling.

Embodiment 3

Use with 60% butachlor 2.5kg/ hectare, 20% Stam F-34 missible oil 9.4kg/ hectare and 56% mcpa sodium 0.5kg/ hectare, convert water 900kg/ hectare, the soil surface that exposes in stem, leaf and the field of dryland paddy weeds in the 4 leaf phases of dryland paddy barnyard grass grass, in no rainy day gas even spraying.Through observing: the blade flavescence of grass family and other section weeds after 12 hours, lobus cardiacus is withered, weeds in field dehydration in blocks in 2～3 days is withered, all weeds in field stems, leaf all dried up dead from the point to the root in 6～7 days, the field does not have weeds and grows in 40 days, kill and always the rate of preventing and kill off reach 99.5%, to the rice strain did not influence of tillering, and have rice strain stalk and increase the thick anti-effect of falling.

Comparative example

With 20% Stam F-34 missible oil 11.25kg/ hectare and 56% mcpa sodium 0.75kg/ hectare, convert water 900kg/ hectare, in the 4 leaf phases of dryland paddy barnyard grass grass, on the soil that no rainy day even spraying is exposed in the cauline leaf and the field of dryland paddy weeds in field, the cauline leaf flavescence of grass family and other section weeds after 3 days, weeds in field dehydration in blocks is withered after 7 days, the most of weeds cauline leaf in field is withered dead from the point to the root after 15 days, and have new many weeds to grow after 7 days at the spray medicine, there is nearly field to become the weeds of strain weeds 15% to grow after 20 days, kills and total control rate 80%.

And getting 60% butachlor ec 2.0kg/ hectare, 20% Stam F-34 missible oil 10.0kg/ hectare and 56% mcpa sodium 0.5kg/ hectare, the present invention uses with, convert water 900kg/ hectare, in the 4 leaf phases of dryland paddy barnyard grass grass in no rainy day even spraying on the cauline leaf and field exposed ground of dryland paddy weeds in field, the cauline leaf flavescence of weeds after 12 hours, lobus cardiacus is withered, weeds in field dehydration in blocks in 2～3 days is withered, all weeds in field are all withered dead from the point to the root after 6 days, the field does not have weeds and grows in 40 days, kills and total control rate reaches 99.5%.

Claims (3)

1. chemical herbicide for dry rice field agent, comprise Stam F-34 missible oil and mcpa sodium, it is characterized in that: by weight by 60% butachlor ec, 2.0～3.0kg/ hectare, 20% Stam F-34 missible oil 7.5～11.5kg/ hectare and 56% mcpa sodium, 0.225～0.75kg/ hectare constitutional chemistry agent for preventing and eliminating.

2. according to the described chemical herbicide for dry rice field agent of claim 1, it is characterized in that: the available 50% quinclorac wetting powder of described 20% Stam F-34 missible oil, 7.5～11.25kg/ hectare 0.1～0.6kg/ hectare substitutes, and the available 20% mcpa sodium aqua of described 56% mcpa sodium, 0.225～0.75kg/ hectare 0.6～1.8kg/ hectare substitutes.

3. the application process according to the described agent for preventing and eliminating of claim 1 is characterized in that: by weight above-mentioned prescription is added clear water 800～1000kg/ hectare and fully mix; After upland rice emerges, adopt spray pesticide method even spraying on weeds in field cauline leaf and exposed ground in the no rainy day.