Ratio of ammonium and nitrate to response of chinese broccoli variety (Brassica oleracea Var. Alboglabra) in hydroponic culture

Abstract

The objective of this study is to study the response of various chinese broccoli varieties to ratio of ammonium and nitrate and to determine the characters that have high heritability values. This research was conducted at the Screen House at the University of Hasanuddin Lecturer Residences, Tamalanrea Sub-district, Makassar from August to October 2019. This study was arranged by using nested design and randomized complete block design as its environmental design. Replication was set in nesting to each ratio of ammonium and nitrate. The main factor was 7 varities of chinese broccoli, namely Full White, New Veg Gin, Winsan, Yama F1, Sakura F1, Nemo, and Nova, while ratio of the ammonium and nitrate consisted of 4 levels, namely AB Mix, ammonium: nitrate (1: 4), ammonium : nitrate (1: 8) and ammonium: nitrate (1: 12). The results showed that the ratio of ammonium and nitrate which gave the high growth and production responses to chinese broccoli was ammonium: nitrate ratio of 1: 12 (171.38 g). Varieties that have high growth and production response to the amomonium and nitrate ratio was the chinese broccoli New Veg Gin (214.04 g). Characters that have high heritability are leaf numbers, leaf area, shoot fresh weight, and total weight.