تأثير السماد العضوي- الحيوي في نمو وحاصل البطاطا والمتبقي من بعض العناصر الغذائية في التربة

Abstract

Filed experiment was undertaken in private field in Al-ramadi area Anbar Governorate in the right side of Euphrates river in silt loam soil during the spring season of 2012 to test the effect of bio- organic fertilizer in growth and yield of potato and the residual of some plant nutrients in the soil. The experiment involved 9 treatments among them adding the recommended N, P and K fertilizer for potato (220 kg N h-1, 52 kg P h-1 and 167 kg K h-1)as control. The other treatments were adding the recommended rates of N,K and 1/2 P , N and K for potato fertilizing with and without adding 1.5% of sold bio- organic fertilizers (prepared by composting mixture of chicken manure with wheat straw inoculated with solubilizing phosphate and free fixing nitrogen microbes and enriched with 0.46 by weight of phosphate rock powder ) by weight of the soil to the depth of 15 Cm and using liquid part of the bio- fertilizer to soak the potato seed before planting and to spray the foliage part of potato plant. The results showed the superiority of all the treatments receiving solid bio-organic fertilizer in containing the highest residual of available N, P, K, Fe, Zn in the soil at the end of the experiment in comparison with other treatments including the control treatment(adding the recommended N, P and K fertilizer for potato). Adding the recommended N, K and 1/2 P plus solid bio-organic fertilizer with or without spraying of potato plant with liquid bio-organic fertilizer gave the highest plant height, stalk numbers plant-1, vegetative plant dry matter weight, uptake of N, P and K by vegetative growth and tuber yield of potato. Soaking potato seed in liquid bio-organic fertilizer resulted increases in all above mentioned variables in comparison with same treatment without soaking potato seed in liquid bio-organic fertilizer.