Preliminary Study On Different Agronomic Measures And Chemical Herbicides For Weed Control In Forage Oat Fields

Oats,as an excellent forage crop with high protein and fat content,are favored by herdsmen in the arid areas of north China.Inner Mongolia is the main growing area of forage oat.It is of great significance to improve the yield and quality of forage oat in this area.In cultivation practice,weeds are usually an important factor restricting forage oat production.They compete with forage oat for water,nutrients,light energy,etc.,occupy overground and underground space,affect photosynthesis,interfere with growth,and affect its yield and quality.At present,there are few selective herbicides in feeding oat fields at home and abroad.Generally,weeds in the field are controlled by artificial weeding.In this article,therefore,clear the forage in different areas of the Inner Mongolia oat field weed species,distribution,damage and occurrence regularity,on the basis of research on the use of sowing date,row spacing and planting patterns,the width of furrows for sowing and seeding quantity of the possibility of agronomic measures to control the grass,and oats commonly used in the production of 8 kinds of herbicides in forage oat field screening test,in order to explore the forage oat field were the best effective comprehensive prevention and control measures.The results show that:(1)The species and distribution of weeds in feeding oat fields in ordos and baotou of Inner Mongolia were investigated by inverted "W" 9-point sampling method.The results showed that the weed species were different in different geographical environments.The relative abundance of grey-vegetable,pig-hair vegetable,barnyard grass and grey-green quinoa were all above 40,which was the dominant weed population in ordos forage oat field.The relative abundance of amaranth,cabbage and field convolvulus in feeding oat field in baotou were all above 40,which were the dominant species of weeds in feeding oat field in baotou.(2)Agronomic measures can be used to control grass in feeding oat fields,but the effect of grass control is limited.In the experiment of sowing date,in ordos,April 11th is the best day to sow,and the higher yield can be obtained,and the grass control effect is better.The results of row spacing test showed that the grass control effect of feeding oat was better when the row spacing was between 12 and 15 cm,and higher yield could be obtained.The results of different planting patterns showed that adjusting the planting patterns of forage oats and barley could effectively reduce the density of weeds in the field,and the grass control effect was obviously better than continuous cropping of forage oats.The results of the investigation on the sowing range and amount showed that in ordos,the sowing range of 15 cm was the best under the condition of sowing amount of 15 kg/667 m2,which could make the fresh weight and grain yield of oat were higher.In baotou,the density of weeds in each treatment was similar,among which the yield of m10-b15(sowing amount of 10 kg/667 m2 and 15 cm)and m15-b15(sowing amount of 15 kg/667 m2 and 15 cm)was higher,and the difference between the two was not significant.Considering the production maximization comprehensively,it is recommended to sow 15 cm and 10?15 kg/667 m2.(3)Forage oat field can be used for weeding with dimethyl-pentamine,2·methyl bromophenonitrile,chlorofluoropyraxoacetic acid,which has a safe and non-toxic effect on feed oat,high prevention effect,long duration of efficacy and obvious effect of increasing yield.In ordos,artificial weeding was the most effective control for the number of plants on day 25 after application,followed by the combination of dimethylamine and sperm-isopropyl methachlor.The control effect of the number of plants was 91.88%,which was significantly different from the control of sperm-isopropyl methachlor and non-weeding.After application,the plant number of 2·MBR had the highest control effect,which was 96.92%,which was significantly different from that of the control group.The fresh and heavy control effect of 2·MBR was the highest(99.83%)at 45d after application,which was significantly different from that of sperm-isopropyl chlor,chlorofluoropiroxyacetic acid and unweeted control.In baotou,the highest number of 25 d control effect after applying pesticide for artificial weeding,followed by 2·a bromoxynil and horse fine pbo grass mixture of spirit(30 mL/667 m2+30 mL/667 m2),the number of control effect of 93.17%,with dimethyl e spirit,jing-isopropyl amine alone a grass,dimethyl e spirit and extract-isopropyl methyl amine mixed oxygen ethanoic acid,chlorine,fluorine pyrazole and no significant difference was weed control;The plant number control effect and fresh and heavy control effect of artificial weeding on 45 days after application were the highest(96%and 99.50%,respectively),followed by 2·methylbromobenzenitrile.The plant number control effect and fresh and heavy control effect were 94.51%and 99.38%,respectively,which were significantly different from those of dimethylamine,sperm-isomethylamine alone,dimethylamine and sperm-isomethylamine mixed and unweeded.The determination of fresh weight in two experimental plots showed that the fresh weight of artificial weeding was the highest.