Effect of topping, humic acid, mulching color and their interactions on vegetative growth and seed yield of okra : (Abelmoschus esculentus L.)‎

الملخص EN

This study was carried out during 2016 growing season at the vegetative research farm of the College of Agriculture, Duhok University, Kurdistan region on okra plants, to study the effect of topping (after 4 leaves and 7 leaves), three levels of humic acid (0, 20 and 40 m.l-1) and four mulching color (without mulch, black mulch, clear mulch and blue mulch) on okra (Clemson).

The results showed that topping after 7 leaves significantly increased branch numbers, leaf area and dry pod .

Humic acid at 40 m.l-1 significantly increased leaf area, dry pod and seed weight, while humic acid at concentration 20 m.l-1 increased number of seeds.

Mulching significantly enhanced all studied traits.

The interactions between topping after 7 leaves and 20 m.l-1 humic acid significantly increased brunch number, leaf area and seed number.

The dual interaction between a topping after 7 leaves and clear mulch significantly enhanced brunch numbers, leaf area and dry pod.

And the interactions between humic acid and mulching significantly increased most characteristics.

The interactions between topping, humic acid and mulching caused positive significant differences in all vegetative and seed characteristics.