The effect of nitrogen and potassium on yield, and agronomic traits of cowpea (Vigna unguiculata L.) in dry conditions

Subject Areas : crop production

علي  عبدزاد گوهري ¹ (گروه کشاورزي دانشگاه آزاد اسلامي واحد لاهيجان. ايران )

Received: 2010-10-28 Accepted : 2011-09-09 Published : 2011-01-08

Keywords: Cowpea, nitrogen, potassium, yield ,

Abstract :

The use of appropriate fertilizer and its consumption in the crops, is of important factors in achieving high performance in the product. In order to investigate the effect of nitrogen and potassium fertilizer on yield and yield components of cowpea, an experiment was carried out in a factorial randomized complete block design in 2009, with 3 replications at Astaneh Ashrafiyeh, in East Guilan Province. The factors included nitrogen fertilizers 0, 30 and 60 (kgN/ha) and potassium fertilizers 0, 30 and 60 (kgK/ha). Interactions of nitrogen and potassium fertilizer showed 30 (kgN/ha) and 30 that (kgK/ha) with grain yield of 1555 (kg/ha) was the highest. The nitrogen and potassium fertilizers had significant effect on total biomass, harvest index, seed weight, and number of pods per plant, pod length, plant height and seed numbers per plant. simple correlation showed that grain yield had significant positive correlation with total biomass, harvest index, pod yield, number of pods per plant, seeds per pod and plant height, but significant correlation was no observed between seed yield and 100 seed weight.

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