Effect of various forms and rates of boron on growth, yield and quality of three sugar beet cultivars Under New Valley Conditions.

Two field experiments were carried out at the Agronomy Department Experimental Farm faculty of agriculture, New Valley University, New Valley Governorate, Egypt during the 2019/2020 and 2020/2021seasons, to study the effect of various forms and rates of boron on growth, yield and quality of three sugar beet cultivars. Seven foliar application of boron (borax) Na2B4O7 .10 H2O (11% B) and nano boron oxide were sprayed on sugar beet after 60 and 90 days from sowing). for each boron form spraying (control, 100,200,300 ppm borax and 100,200,300 ppm nano boron oxide twice in a row at 60 and 90 days from sowing). was arranged horizontally. as well as sugar beet cultivars (Gazelle, Kawemira and Hossam) were distributed in vertically. The obtained results revealed that boron foliar application at the rate of 300 ppm nano boron oxide fed-1twice in a row at 60 and 90 days from sowing. recorded the highest significant mean values of root length(cm), root diameter(cm), single root weight(kg/plant), leaves weight/plant (kg plant-1), root yield (ton fed-1), sucrose percentage, sugar recovery percentage and sugar yield (ton fed-1) traits in the two growing seasons. Meantime, hossam cultivar was superior to the others of all studied traits. All interaction effects showed significant differences for traits in the two growing seasons. Were obtained from hossam cultivar with 300 ppm nano boron oxide fed-1 twice in a row at 60 and 90 days from sowing.