| Study on weed occurrence and control in conservational tillage for spring maize in Weibei dry plateau |
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| DOI：10.7606/j.issn.1000-7601.2009.05.14 |
| Key Words: loess plateau conservational tillage spring maize weed control effect |
| Author Name | Affiliation | | MA Zhiqing | Biorational Pesticide R＆D Center of Northwest A＆F University， Yangling， Shaanxi 712100, China | | JIANG Zhili | Biorational Pesticide R＆D Center of Northwest A＆F University， Yangling， Shaanxi 712100, China | | LIU Yuexian | College of Mechanical and Electronic Engineering of Northwest A ＆F University, Yangling, Shaanxi 712100, China | | XUE Shaoping | Huangling Stock Seed Propagation Farm, Huangling, Shaanxi 727300, China | | HAO Mingde | College of Mechanical and Electronic Engineering of Northwest A ＆F University, Yangling, Shaanxi 712100, China | | ZHU Ruixiang | College of Mechanical and Electronic Engineering of Northwest A ＆F University, Yangling, Shaanxi 712100, China | | FENG Baili | College of Agronomy of Northwest A ＆F University Yangling Shaanxi712100 China | | ZHANG Xing | Biorational Pesticide R＆D Center of Northwest A＆F University， Yangling， Shaanxi 712100, China |
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| Abstract: |
| An experiment was conducted to evaluate the influences of different planting patterns of spring maize as one crop per year on weed occurrence law and chemical weeding effect in Weibei dry plateau.The results show that there is no significant difference about weed species in spring maize filed between conservational tillage and no-till, straw mulch (CNS) and conventional tillage (CT) .The dominant species are Convolvulus arvensis L., Chenopodium glaucum and Amaranthus retroflexus L., while the main difference lies in dense density of weed under conventional tillage.After soil is treated with 96% Dual Gold EC or 70% acetochlor EC under 900 mL·hm-2, there is a certain control efficacy to weeds and safety for maize for conservational tillage.The effect of Dual Gold was superior to acetochlor, and the fresh weight control effect is as high as 87.4% after 50 d.Both 20% Gramoxone at 1.5 L·hm-2 and 40% Atrazine SC at 2.25 L·hm-2 can effectively control weeds in corn fields by spraying, and Gramoxone is better than Atrazine, the effect is as high as 88.4% after 23 d.The three kinds of control methods of the four herbcides tested all have a yield-protecting function, among which 20% Gramoxone water agent had the best effect.Thus, for weed control in corn fields under conservational tillage in the Loess Plateau, we can give priority to Dual Gold 96% EC for soil treament after tillage, followed by directional spray of 20% Gramoxone water agent in the seedling stage. |
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