Effect of planting date, N and P application levels on growth characters of Giza 80 cotton cultivar. Effect of planting date, N and P application levels on the yield of Giza 80 cotton cultivar. Effect of planting date, N and P application levels on seed index, line percentage and technological characters of Giza 80 cotton cultivar. study on weed control treatments Effect of planting date, N and P application levels on growth characters of Giza 80 cotton cultivar. Effect of planting date, N and P application levels on the yield of Giza 80 cotton cultivar. Effect of planting date, N and P application levels on seed index, line percentage and technological characters of Giza 80 cotton cultivar. EFFECT OF SOYBEAN PLANTING METHODS ON THE EPFCIENCY OP HERBICIDES II- YIELD, YIELD, COMPONENTS AND CHMICAL CONTENTS EFFECT OF WEED COMPETITION AT DIFFERENT PERIODS THROUGHOUT THE GROWTH OF SOYBEAN ON GROWING AND YIELD EFFECT OF SOYBEAN PLANTING mETHODS ON THE EFFICIENCY OP hERBICIDS 1- GROWTH CHARACTERS AND ASSOCIATED WEEDS