H. GREISS1 and N. PETKOV2
1 Agricultural Company "Agromier", Eg-11211 Cairo, Egypt
2 Sericultural Experiment Station, BG-3000 Vratza, Bulgaria
GREISS, H. and N. PETKOV, 2001. Effect of balanced NPK and micronutrient fertilization of mulberry plantations on the development and productivity of silkworm (Bombyx mori L.). Bulg. J. Agric. Sci., 7: 81-85
The effect of balanced fertilization of mulberry plantations with NPK and micronutrients (Mg, Mn, Fe, Zn, Cu, B, Mo) on the development and productivity of silkworm was studied.
It was established that along with basic mineral (NPK) and organic fertilization, the balanced application of studied basic microelements in the soil of mulberry gardens has a positive effect not only on the productivity and quality of mulberry leaves but also on the development of the most important productive traits of silkworm.
Combined fertilization of mulberry plantations with mineral fertilizers at rates of N300P150K120 kg/ha, 15 t/ha organic fertilizers and the application of basic micronutrients in accordance with the requirements of the soil type leads to the increase of larval viability with 6.83-13.67%, raw cocoon yield per 1 box (20 000 ± 200 viable eggs) with 2.34-4.37 kg (8.06-18.09%) and reduction of larval stage with 48 h compared to the control (fertilized only with N300P150K120 and 15 t/ha organic fertilizer).