الفهرس 
Effects of phosphorus fertilization, humic acid soil application, humic acid foliar application and their interaction on growth parameters at harvest.Only 14 pages are availabe for public view
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Abstract
The current study was conducted to assess the main and interaction effects of
humic acid with different levels of phosphate fertilizer on growth and productivity
of Grain Sorghum {Sorghum bicolor (L) Moench} Grown in Calcareous Soil. Two
field experiments were carried out consecutively at Tamiya experiment station
Agric. Res. center (A.R.C), Fayoum Governorate Egypt, during the summer
growing seasons 2019 and 2020. The experimental layout was a split- split plot
arranged in randomized complete block design with four replications.
Phosphorus levels were arranged in the main plots (P 15 =100, P 30 =200 and
P 45 =300 P 2 o 5 kg/fed). While humic acid (H) was applied as soil application
treatments randomly arranged in the sub plots; (0 (H 0 ), 10 (H 10 ) and 20 (H 20 )
kg/fed). Three foliar spraying of humic acid was (0 (F 0 ), 400 (F 1 ) and 800 (F 2 )
mg/L), arranged in the sub-sub plots.
At the vegetative growth results displayed that application of phosphorus
fertilizers had a significant effect in all growth parameters. The best results were
obtained by P 2 followed by P 3 treatments in terms of increasing growth parameters
(plant height, number of leaves plant -1 , flag leaf area plant -1 , leaves and stem dry
weight plant -1 ) in both seasons at harvest compared with the other treatments. At
harvest, the same results were found on yield attributes (plant height, panicle
length, panicle diameter, panicle weight plant -1 , panicle grain weight plant -1 ) and
yield (biological yield ton fed., -1 , straw yield ton fed., -1 ,panicle yield fed., -1 , grain
yield fed., -1 and shelling percentage (%) .
Foliar spraying of humic acid (F 1 ) and (F 2 ) reflected positive significant
influences on growth parameters, yield and its components in both seasons. F 2
followed by F 1 were the potent treatment for increasing growth parameters, yield
and its components compared with control treatments (without humic acid).
The interaction effect between phosphorus levels and foliar spraying was
significant in both seasons on growth parameters; yield and its components. The
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best combinations were foliar spray F 2 combined with P 45 followed by P 30 which
significantly increased growth characteristics, yield and its components.
There were no significant differences between P 45 and P 30 treatments in the
most of studied traits especially in the grain yield. Therefore, under newly
reclaimed soil condition such as in the current Egyptian situation, P 30 combined
with H 20 could be considered a potential treatment for improving the growth and
productivity of grain sorghum, with raising the percentage of organic matter in the
soil by adding 20 Kg humic acid of as soil application.
Key Words: Sorghum, Phosphorus fertilizer, Humic acid, Vegetative growth,
Yield.