Studies on cotton requirements from some nutrients. 1.-effect of phosphorous and potassium applications and their deficiencies on growth, yield, earliness and fiber quality of Giza 70 cultivar

abonos fosfatados abonos potasicos caracteres de rendimiento carence du sol composante de rendement crecimiento croissance crop yield deficiencias del suelo engrais potassique exigence des plantes fertilisation fertilizer application gossypium barbadense growth necesidades de las plantas phosphate fertilizers plant requirements potash fertilizers rendement des cultures rendimiento de cultivos soil deficiencies yield components