Investigation of the effects of insecticide applications in different development periods on yield and yield elements in the second product (Glycine max. Merill L.)

The aim of this study was to investigation of the effects of insecticide applications in different development periods on yield and yield elements in the second product. The field experiments were carried out at the experimental area of Dicle University of Agricultural Faculty in 2020. The experiments were conducted as randomized complete blocks with three replications. This experiment was applied insectisic at four different growth stage (1. vegetative, 2. Generative, 3. Maturity, 4. Control). To determine effects of ınsectıcıde applıcatıons ın dıfferent development perıods on yıeld and yıeld elements ın the second product. As plant height, node number, pod number per plant, seed number per plant, the first pod hight, the pod lenght, chlorophyll amount, 100 seed weight, seed yield were determined, protein and oil content which provide important information about quality and fatty acid compositions were determined. As a consequence of trials carried out in field conditions, In the study, the applications were found to be significant on plant height, node number, pod number per plant, seed number per plant, the first pod hight, the pod lenght, seed yield, oil and protein content while were not found significantly on fatty acis composition. Plant heights 62,30-73,73 cm, nod number per plant 10-14,04, pod number per plant 55,19-92,58, seed number per plant, usand grains 109,29-127,21 cm, number of branches 8,80-12,56 units/plant, number of 171,17-276,61, the first pod height 10-10,80, pod lenght 1,81-2,13, 100 seed weight 9,97-11,10 g, seed yield 227,06-345,50 kg/da, protein content 26,68-27,01%, oil content 17,77-20,06% values between were determined. İn terms of fatty acid composition, Which The effects of insecticide were found to be unsignificant. Oleic (%26,68-27,01), linoleic (%38,93-39,51), palmitic (%6,88-7,64), stearic acid rate (%7,57-7,78), myristic (%0,13-0,15), arachidic (%0,87-0,95 were found between values. In this study, it was concluded that insecticide applications come to the forefront in terms of both yield components and quality characteristics on second crop soybean production. Keywords: Soybean, insecticide, seed, yield