The effect of applied triple superphosphate. elemental sulfur and zinc chloride,
either alone or together, at various levels of P (0, 15,22,5, 30 & 37,5 kg P20S Iec"), S
(0, 100, 200 & 400 kg S fed") and Zn (0, 10 & 20 kg Zn fed") on dry matter weight,
seed yield, seed quality (oil. protein and S-containing amino acids contents). residual
availability of P, S & Zn and their uptake by seeds of soybean grown on Nile alluvial
clay loam and calcareous sandy loam soils was examined in pot experiment under                                               green-house conditions,                . The obtained results reveal that a positive response for all studied parameters
to the applied rates of P , S & Z n r each to be highly significant ina II cases under
inc;lividual treatments or most cases of combinations. The magnitude of response to
be dependent upon the concerned treatment, the tested parameter and the soil used.
The double combinations being more effective than the single one. whereas the tri-
conjuncted treatments had the most effective for enhancing the growth, crop yield and
its quality parameters, uptake and availability of nutrients, in both the used soils, The
highest values of dry matter weight, yield and seed oil content under Nile alluvial soil
condition were found when it was fertilized with 22,5 kg P20S, 200 kg Sand 10 kg In
fed", while the corresponding try-combined treatment in calcareous soil was 30 kg
PzOs, 400 kg Sand 10 kg In fed-' , Greatest percentages of protein and S-amino
acids in seed were achieved by 22.5 kg P20S combined with 200 kg Sand 20 kg Zn
per fed in Nile alluvial soil, whereas the corresponding tri-application in calcareous soil
was 30 kg PzOs associated with 400 kg Sand 20 kg Zn per fed. In case of the peak of nutrients uptake, these trl-treatrnents were varied from
nutrient to another. Generally, under all the experimental conditions, the response of
the studied measurements either in plant or soil being more pronounced at lower
applied levels, where the higher doses may caused adverse action. The Nile alluvial
clay loam were appeared higher figures for all tested plant parameters and soil
available nutrients than the calcareous soil under a II experimental treatments that
could be related to fertility status and characteristics of each soil. There were highly
significant positive correlations between each of dry matter production, crop yield,
seed quality parameters and seed uptake of P, S, & Zn on one side and the studied
nutrients application to soil on the other side, It can be concluded that for efficient soybean production with high seed
Quantity, especially under recently-reclaimed soil conditions of Egypt, the
simultaneous application of elemental sulfur along with soluble Zn source (zinc
chloride) and P-fertilization (using triple superphosphate) is essential not only for
increasing crop yield but also to improve the seed quality through improvement of 0",
protein and S-amino acids contents, enhancing nutrients uptake and .recovery from
soil and applied fertilizer and favouring the residual available of nutrients in post-
harvest soils,