Abstract
The experiment was laid out in a randomized complete block design with three replicates. The aim of the work is to investigate the effect of different fertilizers on the rates of beans infestation by different piercing sucking pests Tetranychus urticae, T. cucurbitacearum, Bemisia tabaci and Thrips tabaci and on the resulting crop yield. The fertilizer treatments are Ammonium sulfate, Calcium super phosphate, Potassium sulfate, a mixture of NPK and Micro-elements (Zn, Mn, Fe, Cu, Bo & Mo). Results showed that means of green pods yielded by NPK fertilizer was significantly higher than other fertilizers in the two seasons
Highlights
Bean plant, Phaseolus vulgaris L. is a member of family Leguminosae, rich in nutrients containing relatively high percentage of protein where consumed freshly as green pods or as dry seeds
Field study: A field experiment was conducted for two successive seasons 20122013 in the Horticultural Research Station at Kanater El- Khairiya, Qualiobeya Governorate to focus on the effect of the different fertilizer treatments on the rates of beans infestation by different pests Tetranychus urticae Koch, T. cucurbitacearum (Sayed), Bemisia tabaci (Gennadieu) and Thrips tabaci Lindquist and on the resulting crop yield
The tested fertilizer used as follow: 1- Ammonium sulfate, 20% N2 used by the rate of 200 kg/feddan. 2- Calcium super phosphate, 15% P2O5 used by the rate of 200 kg/feddan. 3- Potassium sulfate, 48% K2O used by the rate of 100 kg/feddan. 4- A mixture of the 3 previous fertilizers N, P & K at the rate of 200, 200 and 100 kg/feddan respectively. 5- Micro-elements solved in water as Folifert
Summary
Phaseolus vulgaris L. is a member of family Leguminosae, rich in nutrients containing relatively high percentage of protein where consumed freshly as green pods or as dry seeds. Fertilizers are sources of mineral elements which plants required for growth and development. Essential mineral elements are ammonium sulfate, potassium sulfate, super phosphate, mixture of NPK and Microelements which have great effects in plant growth and development; their deficiencies or excesses result in marked effects on growth and yield crops. The fertilizer NPK is one that contain three keys constituent chemical elements that are Nitrogen which promotes vegetative growth and green coloration of foliage; Phosphorus plays a major role in root growth, photosynthesis, respiration, energy storage, cell division and maturation; Potassium is important in flower and fruit growth, a plant metabolism, protein synthesis and chlorophyll development Yagoub et al (2011). Researchers have demonstrated that high Nitrogen levels in plant tissue can decrease resistance and increase susceptibility to pest attack. Reduced susceptibility to pests may be reflection of differences in plants health as mediated by fertility management, Phelan et al (1995)
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