Effect of Urea and Humic acid fertilization on some chemical/physical Properties and yield of cow pea Vigna unguiculata (L.) walp

Abstract

This study was conducted in AL-Qaraf region, Thi-Qar province, to study the effect of earth fertilization by
Urea and Humic acid on some chemical/physical properties and yield of cow pea. A local cultivar of cowpea
was planted during autumn seasons of 2009 a factorial experimental design within R.C.B.D with three
replicates was used with two factors. The first factor was the Urea (46%) with three levels (0, 10 and 15kg N/
dunam). The second factor was the humic acid with three levels (0, 300 and 600 g / dunam). the result showed
that :( 15kg N/ dunam) and (600 g humic acid / dunam) treatment gave asignificant superiority on the all
studies characterstic (the ratio of protien , carbohydrate content in cowpea seeds tissues , leaves content of (NP-K))

and (The mean number of nodules , branches/plant , leaf area and plant height respectively) also ( the
pods weight /plant and gave higher total yield (1.77 ton/dunam) (1.52 ton/dunam) respectively) as compared
with other treatments . Interaction treatments result showed that; (15kg N/ dunam) + (600 g humic acid /
dunam) treatment gave asignificant superiority at (the ratio of protein, the mean number of nodules), and for
(leaf area as well as branches/plant and plant height) respectively as compared with other treatments. (10kg N/
dunam) + (600 g humic acid / dunam) treatment gave asignificant superiority on the other studies characterstic
with( carbohydrate content in cowpea seeds tissues , the pods weight /plant and gave higher total yield (2.35
ton/dunam)) , also asignificant leaves content of (N-P-K).