Plant attributes and yield variability due to N in Indian mustard genotypes

Abstract

A field experiment consisting of two N levels (100 % and 50 % RDF) in main plots, and twenty-two genotypes in sub plots was conducted at ICAR-Directorate of Rapeseed-Mustard Research, Bharatpur, Rajasthan during rabi 2016-17 under factorial randomized block design to find the N efficient genotypes, and replicated thrice. The results revealed that recommended levels of N (100% RDF, 80 kg N ha-1) recorded maximum growth and yield parameters, and test weight (6.4 g), seed yield (2666 kg ha-1), stover yield (6550 kg ha-1), harvest index (28.9 %), over 50 % N. The highest stem girth, primary and secondary branches and main shoot length at harvest were found in RH 1215, RH 1118 and RH 1223, respectively. In the yield attributes, the number of siliquae on main shoot, number of seeds siliqua-1, highest seed weight siliqua-1 were found in RH 1215, RH 749 and RH 1441, respectively. The NRCDR 02 recorded the highest biological yield (10728 kg ha-1) and stover yield (8366 kg ha-1), whereas, RH 749 recorded the highest seed yield (2985 kg ha-1) both under normal and limited N supply. The maximum harvest index (31.8 %) and test weight (7.6 g) was recorded in NRCHB 101 and RH 555, respectively. Thus, the varieties DRMRIJ 31 and RH 1215 found efficient both under normal N (100% N) and deficit N supply (50% N).