Effect of potassium levels on its fractions in soil under rice (Oryza sativa L.) cultivation

Abstract

It may be concluded from the results that the application of nitrogen and phosphorus without potassium (K) or inadequate K fertilizer application would cause greater mining of reserve soil K. Hence prior to crop production adequate K fertilizer application is needed.

Genotype‐by‐environmental interaction effects on earliness, semi‐dwarfism, and yield of rice (Oryza sativa L.) mutants in Tamil Nadu, India

“…However, many novel alleles identified through mutation breeding have been largely limited to genetic studies due to their poor agronomic performances (Hedden & Sponsel, 2015; Tu Anh et al., 2018; Yamaguchi, 2008). We have developed semi‐dwarf and early‐maturing mutants of popular rice cultivar IWP through gamma ray‐induced mutagenesis (Ramchander, Pillai, & Ushakumari, 2015; Ramchander, Ushakumari, & Pillai, 2015b). In addition to the improved plant architecture, some of the mutants had high‐yielding and good grain quality traits as reported earlier (Ramchander, Pillai, & Ushakumari, 2015).…”

“…Heretofore, we developed a few semi‐dwarf, short‐duration, and high‐yielding mutants of a popular south Indian cultivar Improved White Ponni (IWP) through gamma ray‐induced mutagenesis. IWP is a popular fine‐grained, high‐yielding, tall, and medium duration rice cultivar but is susceptible to lodging and yield losses (Ramchander, Pillai, & Ushakumari, 2015; Ramchander, Ushakumari, & Pillai, 2015b; Ramchander et al., 2022). Due to the superior performance of the mutants derived from IWP in yield trials, we sought to examine their stability across five different locations in the South Indian state of Tamil Nadu.…”