Response of Some Soyabean Genotypes to Spraying with Potassium Silicate and Its effect on Yield and its Components, as Well as on Pod Worm Infestation Rate

Abstract

A field experiments were conducted at Mallawy Agric. station, (latitude of 28 N, longitude of 30 E and altitude of 49 m above sea level), El-Minia Governorate, Egypt, during two successive growing seasons (2019 /2020) to study the effect of different concentrations of potassium silicate (P.Si), 0,3,6 and 9cm3/L foliar spray, under four soyabean genotypes, i.e. Giza 111, Giza22, Line3(H3L119 selected from Giza82) and Line7(H4L130 selected from Giza83) on yield ,its attributes and seed chemical analysis as well as pod warm infestation. The results indicated that, in both seasons foliar spraying of potassium silicate had highly significant effect on all studied character except seed index (S.I.). The concentration (6 cm3/L.) gave the highest values of seed yield (S.Y./F.) at 31.8 and 31.2% in the two seasons, respectively, as compared to control, as well as decreased the pod worm infestation (P.W.%) by 64.85% average both seasons. In the other hand Giza 22 surpassed the other genotypes regarding most characters, also the interaction between potassium silicate and soyabean genotypes had significant effect for all studied traits in both seasons, except seed weight/plant(S.W.) in the first season, the best values for all traits were obtained by foliar spraying of potassium silicate(6 cm3/L.) with Giza 22, furthermore the interaction ships among seed yield and its attributes through simple correlation( r) and regression(b) analysis were evaluated. Regarding correlation coefficients the seed yield was positively and significantly correlated with number of seeds /plant (No.S/P), number of pods plant-1 (No.p/p), Seed weight/ plant and seed index A strong correlation of seed yield with these traits indicated that, simultaneous improvement of these traits is possible. These findings indicate that selection for each of number of seeds plant-1, number of pods plant-1, seed weight/ plant and 1000-seed weight would be accompanied by high yielding ability under such conditions. Also, the seed yield was positively and significantly correlated with quantity traits Protein percent, oil percent, chlorophyl a (chl,a) + b (chl,b) and carotin(crt.), using silicon may be involved in cell elongation and/or cell division. negative and significant correlations were observed between seed yield (ton/fed.) and each of Infestation pods (P.W.%) and seeds (S.W.%) with pod worm percent. Decrease in these traits will ultimately Increase the seed yield. Regression procedure indicated that 6cm3/L. of potassium silicate gave the highest yield and yield components and reduce the pod worm infestation.