EFFECT OF NITROGEN SOURCES, BORON AND MOLYBDENUM LEVELS ON YIELD AND YIELD COMPONENT OF SNAP BEAN

This study was carried out at EI-Baramoon Horticultural Research Farm
during summer seasons of 1998 and 1999 to study the effect of N-sources, urea
[Co(NH2)2]. Ca-nitrate Ca(N03)2 and ammonium sulphate [(NH4)2S04] at the rate of 50
kg N / fed, boron levels (0, 5 and 10 ppm) and Mo levels (0,10 and 20 ppm) on
growth, yield and quality of snap bean (Phaseo/us vulgaris) cv. Bronco. The obtained
results showed that Ca-nitrate application was the most effective treatment for
increasing stem diameter, pod length, pod width, total yield I plot and total yield I
feddan, followed by urea then ammonium sulphate.
With respect to the effect of boron levels applied, the 10 ppm boron level was the best
level for increasing total yield I feddan and improving quality. While, the 5 ppm boron
level decreased total yield I feddan compared with zero level of boron.
The best Mo level was 20 ppm, which recorded the highest values in most characters
measured in both seasons of study.
Generally, the highest total yield and quality of snap bean plants were obtained when
fertilized with Ca-nitrate at the rate of 50 kg N/fed, 10 ppm of boron and 20 ppm of
molybdenum.