Two field experiments were conducted in both 2000 and 2001 summer
seasons at Sakha Exper. Station to study the effect of some nutritional treatments on
cotton plant growth (var. Giza 86), seed cotton yield, lint percent, oil content of seeds,
protein content of kernel seeds and the net return. The treatments included N, P, K,
micronutrients (coatengien) and 3 biofertilizers being, Nitrobien, Phosphorine and
Rhizobacterien such products are produced by the General Organization for
Agriculture Equalization. These products were examined in combination with half
recommended dose of NPK in order to improving seed cotton-yield, quality, reducing
the required mineral fertilizer by about 50%, increasing the highest net return and
protect the agroecosystem from pollution. The obtained results reveal that: Each of the tested biofertilizer and micronutrient treatments could compensate
more than one half the NPK need of cotton plant accompanied with a notable
yield increased. The balanced fertilization including micronutrients (Fe: Mn: Zn) used as coating
and macronutrients (NPK), could increase the NPK fertilizers efficiency, obtaining
high seed cotton yield under both NPK levels and increase lint percent, plant
height, No. of open bolls/plant and boll weight. The study showed the vital importance of soil analysis, which have low levels of
available N, P, K and some micronutrients it must be fertilized with the
economically beneficial amounts of these nutrients, when we cropped with cotton. Protein, oil content in seeds and N, P & K content of cotton fully developed leaves
at the beginning of flowering stage were increased by 1/2 NPK (35 - 15 + 12
kg/fed.), micronutrients (coatengien) and biofertilizers (Nitrobien, Phosphorine and
Rhizobacterien) applications. The highest cotton seed yield and net return were obtained by full cofertilization
with N7₀P₃₀K24 and N3SP1SK12 + biofertilizer (a + b + c) and micronutrients
(coatengien). These clearly confirmed that the biofertilizer treatments could be used under the
Egyptian conditions as effective tool to compensate the quantities of used the
chemical fertilizers and consequently reduce the consumption of these fertilizers
which turn minimizing the agricultural costs as well as the Egyptian environmental
pollution.