Abstract
Abstract: The objective was to assess the early treatment effect of soybean seeds and pre-sowing with different combinations of chemicals on the establishment of plants and crop yield performance. The design was in randomized blocks in a 2x7 factorial arrangement, with two times for seed treatment and seven treatments (six chemical treatments and an untreated control). The treatments were: 1) fipronil + pyraclostrobin + thiophanate methyl; 2) imidacloprid + thiodicarb + carbendazin + thiram; 3) abamectin + thiamethoxam + fludioxonil + mefenoxam + thiabendazole; 4) carbendazin + thiram; 5) fludioxonil + mefenoxam + thiabendazole; 6) carboxin + thiram; and 7) untreated control (water only). The assessments were: seedling emergence, final stand, plant height and insertion of first pod, number of pods per plant, seeds per pod and per plant, thousand-seed weight and grain yield. Early treatment of soybean seeds (240 days prior to sowing) hinders the establishment of the crop, the thousand-seed weight and grain yield in relation to the pre-sowing treatment. Chemical treatments tested containing fungicides and insecticides associated favor the establishment of the crop, but do not alter the soybean yield performance.
Highlights
In the field, soybean plants are subject to biotic and abiotic stresses that can negatively affect their development and the grain yield
Treatment of seeds for both cultivars and crop locations has damaged seedling emergence compared to treatment in pre-sowing (Table 2)
This result may be associated with reduced seed physiological quality during the storage period, marked by a possible phytotoxic effect of the active ingredients of the chemicals used in the treatments
Summary
Soybean plants are subject to biotic and abiotic stresses that can negatively affect their development and the grain yield These production losses occur primarily through the occurrence of diseases, pests and nematodes (Bradley, 2008). Several tillage techniques are adopted so that these factors can cause the least possible damage to the soybean crop, and chemical seed treatment stands out This process consists of applying compounds capable of protecting seeds against these deleterious effects, helping to control these diseases in the initial period of crop establishment, favoring the seedling emergence and development (Balardin et al, 2011)
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