Growth and Grain Yield of Newly Developed Rice Lines with Very Short Growth Duration in Summer - Autumn Cropping Season in Nghe An Province

Abstract

     The field experiments were laid out in a randomized complete block design (RCBD) with three replications in 2014 and 2015 summer - autumn cropping season in Yen Thanh and Quy Hop district of Nghe An province to assess the growth and grain yield of five new extremely early maturing rice lines (D1, D2, D3, D4, and D5) with two check varieties, Khang Dan 18 (KD18) and Vat tu - NA2 (NA2). The results showed that the growth duration of the rice lines ranged from 88 to 96 days, shorter than that of the check varieties. Dry matter accumulation rate of the rice lines before heading stage was significantly higher than that of the check varieties while pest and disease infestation of the lines was lower at all growth stages. Grain yield accumulation (kg/ha/day) of the rice lines (except D3) was comparable to or higher than that of the check varieties. Grain yield of the rice lines was similar to or significantly higher than the check varieties, with D5 showing highest yield in both growing seasons. Amylose content of the rice lines was below 23%, much lower than that of KD18 (above 28%). Cooking quality of D5 was higher than that of KD18 but similar to NA2.