THE ROLE OF ORGANIC FERTILIZATION IN RAISING POTATO PRODUCTIVE EFFICIENCY AND WATER PRODUCTIVITY UNDER THE CONDITIONS OF ORGANICALLY POOR SANDY SOIL

Water application efficiency, soil organic matter content, water stress inside root zone, EC soil, yield, quality and productivity of potato were investigated under arid poor sandy soils in Egypt during two growing seasons 2018/2019 2019/2020 at the Research Farm National Center (NRC). efficiency average content increased by increasing amount fertilizers applied. The values yield protein carbohydrates N-fertilizers applied up to 50% it decreased with continued increase addition. There are a set positive effects resulted from addition N-organic against one negative effect. N-fertilization led an thus decrease accumulation concentration salts area proliferation until reaching best proportion when adding mineral nitrogen fertilization, while continuing percentage lowest is 100% where, total available (NO3) after fertilization exceeded effect on productivity. Finally, results study concluded that, necessity relying without any significant impact characteristics conditions Egypt.