تأثير الرش بالزنك في النمو الخضري لنبات زهرة الشمس

الملخص EN

A field experiment was carried out in the Spring and Autumn growing seasons of 2018 in Al-Subaihat village (latitude 21° 33° N and longitude 46° 43° E) / Al-Fallujah district / Al-Anbar province in silty-loam soil for both growing seasons.

To determine the effect of spraying the vegetative part with different levels of zinc (Zn), (0, 0.5, 1.0 and 1.5 kg Zn h-1) in the form of ZnSO4.7H2O (65.39% Zn) in the vegetative growth traits of three cultivars of sunflower (Tarsan1018, Eshaqi1 and Aqmar).

The experimental layout was according to factorial arrangement in RCBD design and the experimental units (36 unit) were distributed in three replicates.

Cultivars varied significantly in most of the studied traits, as Aqmar cv.

gave the highest means for plant height, leaves no.

, leaf area and dry weight in both growing seasons, and leaf content of zinc just in the spring season.

Tarsan1018 gave the highest mean for SPAD chlorophyll index in both growing seasons.

Zinc spray resulted in a significant increase in all of the studied traits as the level of 1.5 kg h-1 recorded the highest mean for plant height, SPAD chlorophyll index, leaves no.

and dry weight in spring season, and seed content of zinc in both seasons, meanwhile the level of 1.0 kg h-1 achieved the highest mean for plant height, SPAD chlorophyll index, leaves no.

and dry weight in the autumn season, and for leaf area in both growing seasons.

The interaction between cv.

Tarsan1018 and the 1.5 kg h-1 concentration gave the highest mean of SPAD chlorophyll index reached 52.37 SPAD in the spring season, and cv.

Aqmar that sprayed with 1.0 kg h-1 of zinc recorded the highest mean of leaf area in sprong season reached 8659 cm2 plant-1.

The interaction between cv.

Aqmar and the concentration of 1.5 kg h-1 recorded the highest mean of leaf content of zinc reached 108.61 mg Zn kg-1 in spring season, and cv.

Tarsan1018 with the same spray concentration gave the highest mean in spring season 96.90 mg Zn kg-1.