Revista Brasileira De Herbicidas 2002; 3(2-3): 139-144
Herbicides alachlor pendimethalin and trifluralin on the nodulation and initial growth of peanut plants
This work had the objective of evaluating the effect of the herbicides alachlor, pendimethalin and trifluralin on the initial growth of peanut plants (Arachis hypogaea L.) under greenhouse conditions for a period of thirty days as well as nodule number and dry weight for sixty days after the sowing period. The experiment was conducted at the Agronomy College of the Federal University ofBahia.The first experimental design was completely randomized with four treatments (control- rate zero; alachlor – 2.90 kg/ha, pendimethalin – 1.00 kg/haand trifluralin – 0.89 kg/ha) and three replieations. For each replication, plastie trays (70 em x 50 em x 10 em) were used with a yellow Latosol as the substrate and peanut seeds of the variety BRS 151-L 7 provided by EMBRAPA-CNPA. A seeond experiment was condueted with plastic pots of 5 kg, the same substrate, same treatments and experimental design with eight replieations. The following parameters were evaluated: seedling emergence, percentage of abnonnal seedlings and dead seeds, plant height, index of seedling emergenee velocity, root and shoot dry weight,number and dry weight of nodules. The results show that herbieides stimulate the initial nodulation of peanut plants, but reduce the pereentage of emergence, shoot dry weight and plant height. Therefore, the herbicides should be recommended with restrietions, for the studied eonditions. .
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