Depth of placement of the herbicide imazethapyr plus imazapic in soil profile on non-tolerant rice injury

作者：Bundt Angela Da Cas; de Avila Luis Antonio^*; Agostinetto Dirceu; Nohatto Marcos Andre; Souto Kelen Mueller; Senseman Scott Allen

来源：Ciencia Rural, 2010, 40(9): 1867-1873.

DOI：10.1590/S0103-84782010000900003

• leaching
• persistence
• Oryza sativa
• depth location

The herbicides imazethapyr and imazapic, used in Clearfield (R) rice, have high mobility and persistence in the soil, causing injury 10 non-resistant rice grown in rotation These herbicides can leach and reach greater depths along the profile This positioning can he a in-depth selectivity factor and partially explain the different results found in literature about carryover of inudazolines To understand this effect, this study had the objective of to evaluate the effect of the positioning of the mixture of imazethapyr and imazapic (75g at L(-1) and 25g at L(-1)) on the injury to non-resistant rice crop Two experiments were carried out in soil with 15% clay and 1 2% organic matter in a greenhouse at the Universidade Federal de Pelotas. Pelotas, RS, Brazil Experiment I consisted of a preliminary study to verify the location depth of the herbicide in the soil profile that causes injury to rice non-tolerant rice. and the herbicides has been allocated at depths of 0, 5, 10, 20, 30, 50 e 70cm Experiment II also consisted in Me allocation of herbicide at depths in the soil profile of 3, 6, 9, 12, 15 and 18cm The variables were visual plant injury, plant shoot dry weight and plant height The formulated mixture of imazethapyr + imazapic located neat the soil surface cause injury to non resistant rice plants but when allocated at depths greater than 20cm of the soil surface does not affect the development of non-resistant rice

• 出版日期2010-9