Effect of Spraying date of boron on Vegetative Growth and Yield of Cotton Plant (Gossypium hirsutum L.) Lashata Variety

Abstract

A field experiment was conducted during the spring season of the year 2018 in the fields of the Cotton Research Unit at the Technical Agricultural College / Mosul to study the effect of spraying the element boron for different dates (the stage of vegetative growth, the stage of opening blooming buds, the stage of boll formation) and the interferences between these dates on the characteristics of vegetative growth and cotton components Lashata cultivar, and used the design of complete randomized block in the implementation of the experiment. The results of the study showed that the date of spraying with boron in the two stages of vegetative growth and flowering buds open significantly exceeds the rest of the dates in the characteristics of plant height (cm) and the number of nodes up to the first fruit branch and the number of vegetable branches and the number of fruit branches in values (135.8 cm, 6.1, 4.5, 16.8) respectively, the duration of spraying with boron in the vegetative stage exceeded the rest of the dates by its effect on the characteristics of the total number of bolls and the weight of one boll (gm), the seed index and the yield of the cast cotton values (36.8, 6.82 g, 4.050, 995.2 kg −1), respectively. the date of spraying is also superior in the vegetative stage of growth significantly on the rest of the dates on the characteristics of its effects type (E and percentage of hair and the percentage of the early) values (42.8, 40.5% staple guide, and 82.15%) respectively.