GT BIPLOT ANALYSIS FOR YIELD AND RELATED TRAITS IN SOME SUGAR BEET VARIETIES AS AFFECTED BY COMPOST UNDER SALINE SOIL

Abstract

Two field trials were carried out during two successive seasons of 2018/2019 and 2019/2020 at farmer’s field, Tamiya, (latitude of 29.58 o N, longitude of 30.96 o E and altitude of 34 m above sea level), Al Fayoum Governorate, Egypt, to evaluate the performance of eight sugar beet varieties under four levels of compost (without, 2, 4, and 6 ton /fed) in saline soil. A split-plot design with three replications was used in both seasons. The results revealed that treating the soil with 6-ton compost/fed significantly increased root diameter, root fresh weight/plant, sucrose and extractable sugar percentages, sodium content, root and sugar yields/fed as well as alpha-amino N content decreased in both seasons. Meantime, the proline, potassium, sodium contents and sugar lost to molasses% were insignificantly affected by compost levels in 1 st season and the second one. Indira-KWS mono-germ variety exhibited superiority over the all other tested varieties, which recorded the highest values of root diameter, root fresh weight/plant, sucrose%, root and sugar yields/fed as well a significant decrease in proline content in both seasons. While, both mono-germ Carma variety and multi-germ Shrb 21802 variety had the lowest value of sodium content without significant difference between them in both seasons, compared with the other varieties. There was a highly significant and positive correlation between root yield and each root diameter and root weight. The genotype by trait (GT) biplot graph was used to compare varieties based on multiple traits. It proved to be a reliable and easy-to-interpret analysis and visualization of the results. interpret analysis and visualization of the results. Under conditions of this work, planting mono-germ variety (Indira-KWS) and fertilized it with 6ton compost/fed can be recommended to get the higher root and sugar yields/fed under saline soil condition. INTRODUCTION Most soils in Al-Fayum governorate are affected by soil salinity very around Lake Qaroun in large areas connected to most of the city, such as Tamiya, also the salt rates range from 2 dsm -1 to 17 dsm -1 and have a significant impact on the growth of crops and reduce agricultural Egypt. J. of Appl. Sci., 36 (3) 2021 66-83