تأثير التلقيح و التسميد النتروجيني و قرط القمة على نوعية و كمية الحاصل لنبات اللوبياء [Vigna unguiculata L. (walp)‎]

Abstract EN

This study was conducted on the field of Agriculture and Biological Research Administration (previously the Iraqi Atomic Energy Commission).

A local cultivar of cowpea was planted during spring and autumn seasons of 2002, and split– split plot design with three replicates was used.

Two levels of bacterial inoculation (with and without inoculation) with a local strain of Bradyrhizobium spp.

which is symbiotic with cowpea plant were palced in the main plot.

Moreover, in the sub-plots nitrogen fertilizer (0, 40 and 60 kg N/ ha) in the form of urea (46%N) was used, while top pinching over the third true leaf by two levels (with and without pinching) was used in the sub- sub-plots.

Means were compared using the Least Significant Differences (L.S.D.) test at probability level of 5%.

Results showed that bacterial inoculation with the addition of 40 kg N/ ha and top pinching treatments significantly gave the highest total production of green pods for one plant and unit area (1184.76 and 1155.43 gm), (8.88 and 8.64 ton/ha) in the spring and autumn seasons, respectively.

Also, results showed a significant effect of bacterial inoculation, by increasing seed content of protein (24.78% and 24.80%), carbohydrates (62.23% and 62.23%) and fiber (3.24% and 3.27%) for both seasons, respectively.

The application of 60 kg N/ha gave similar results, while pinching has no significant effect on the quality characteristics of cowpea pods and seeds.