ABSTRACT
A field experiment was conducted in sandy soil at Fayoum
Government in Egypt, during the two summer seasons of 2019 and 2020.
The objective of this experiment was to study the response of sorghum
(Hybrid 305) to foliar application with some organic compositions
(Ascorbic acid and potassium silicate) under different four mineral
fertilizers (25, 50, 75 and 100 %) comparing with the four mineral
fertilizers without spraying. Plants were sprayed with ascorbic acid at
rate of 500 ppm/ L and 6 m / L of potassium silicate at three periods (21,
45 and 60 days from sowing). Results should that application of foliar
ascorbic acid and potassium silicate on sorghum produced significant
increases in the studied characters comparing with the untreated plants.
The treatment (75 % N + potassium silicate) achieved the earlier in
flowering, the highest values of grain weight / head and the highest
values of grain yield (22.55 ardab / fed) and the nutrients content in
grains this treatment obtained the higher values (10.38, 0.490 and 0.436
% for protein, P and K, respectively compared with the treatment (100 %
N without spray).The treatment (100 N % + potassium silicate) increased
no. of days to 50 % flowering, gave the highest values of plant height,
stem diameter, number and area of leaves, 1000 – grain weight and the
highest value of green yield (12.40 ton / fed) compared with the
treatment (100 % N without spray). Therefor it is possible to grow
sorghum under sandy soil and increase grain yield and its nutrients
content also reduce environmental pollution with reduce 25 % of mineral
fertilizer by using some organic compositions (potassium silicate).