Growth Analysis of Rice Hybrids as Influenced by Dates of Transplanting under Lowland Conditions

Abstract

A field experiment was undertaken at the Experimental Farm of Department of Agronomy of CSK Himachal Pradesh Krishi Vishvavidyalaya, Palampur (H.P.) during kharif 2020 to study the growth and performance of rice hybrids under different dates of transplanting. The treatments consisted of three different dates of transplanting viz., 2^nd week of June (12 June), 3^rd week of June (19 June) and 4^th week of June (26 June) as main plot and four rice varieties (three hybrids viz., Arize AZ 6508, Arize Swift Gold, Arize 6129 and check HPR 2143) as sub plot tested in split plot design. The trial was laid out with three replications. The plant height was not significantly influenced by the different dates of transplanting at all the stages of observation. Significantly higher dry matter at all stages of observation was accumulated by the crop when transplanting was done in 3^rd week of June though it was statistically at par with 2^nd week of June transplanting. Significantly higher CGR values between 30-60 and 60-90 DAT was recorded when the crop was transplanted in the 3rd week of June though this was statistically at par with the 2^nd week of June transplanting which in turn was at par with the 4th week of June transplanting. The different dates of transplanting had no influence on the relative growth rate between different growth stages. Significantly higher grain yield was recorded in the 3rd week of June which was at par with the crop transplanted in the 2^nd week of June, which was in turn was comparable to the crop transplanted in the 4th week of June. Rice genotypes also differed significantly with HPR 2143 producing significantly taller plants while Arize Swift Gold producing shorter plants. Hybrids accumulated more dry matter as compared to check variety HPR 2143 with Arize AZ 6508 recorded significantly higher value of this parameter. Among the varieties tested Arize AZ 6508 recorded significantly higher values of CGR between 30- 60 DAT as well as 60-90 DAT though it was at with other two hybrids which in turn were at par with the check variety. RGR was not significantly influenced by varieties. Among the rice hybrids, Arize AZ 6508 produced significantly higher grain yield though this variety was statistically at par with Arize Swift Gold which in turn was at par with Arize 6129.