The research experiment was carried out during the 2007, 2008 and 2009,
seasons on grape variety Al- Helawani (10 years old) to study the effect of
N.P.K. fertilization rates and the triple superphosphate (T.S.P) application
method on some fruits
characters and growth indicators. Three fertilization
N.P.K rates were used, rate 1 (75:25:50) kg/ ha, twofold and fourfold of rate 1,
in three replicates in addition to control. The application of (T.S.P) was on soil
surface and at 30 cm depth, the percent of leaf area, shoot length, the degree of
berry colour, berry firmness were calculated. The results showed a significant
increase of leaf area, shoot length and the Berry colour compared to control.
The third rate was the best for increasing the leaf area and shoot length, while
the first and second rates were increased the colour of Berry. At the same time,
there was a gradual significant decrease in Berry firmness compared to control
when the rate of fertilizer was increased. It was also noted a significant increase
in leaf area (11%) and shoot length (4.5%) in deep T.S.P application compared
to the surface application.
