“Nikomaru”, A New Rice Variety with Excellent Palatability and Grain Appearance Developed for Warm Region of Japan

Grain yield and quality responses to nitrogen application rate and timing in dry direct broadcast seeded rice under different weather conditions

“…Plants received either 60 or 90 kg ha −1 N in accordance with three N application protocols: (1) 66.7% applied at the four‐leaf stage, 16.7% applied at the tillering stage, and 16.7% applied at reproductive stage (8.3% applied at 20−22 days before heading and 8.3% applied at 10−12 days before heading) (N application at the four‐leaf stage); (2) 16.7%, 66.7%, and 16.7% (8.3% and 8.3%), respectively (N application at the tillering stage); or (3) 16.7%, 16.7%, and 66.7% (33.3% and 33.3%), respectively (N application at the reproductive stage). A rice cultivar Nikomaru, with high palatability of cooked rice and grain appearance (Sakai et al., 2007), was used.…”

“…The experiment treatments included two N application rates (60 and 90 kg ha −1 N) and three N application timings (the four-leaf, tillering, and reproductive stages), arranged in a randomized complete block design with three replicates. Plants received either 60 or 90 kg ha −1 N in accordance with three N application protocols: (1) 66.7% applied at the four-leaf stage, 16.7% applied at the tillering stage, and 16.7% applied at reproductive stage (8.3% applied at 20−22 days before heading and 8.3% applied at 10−12 days before (Sakai et al, 2007), was used. The field was plowed by a cultivator 5 and 2 days before seeding in 2019 and 2020, respectively.…”

Comparisons of the stomatal conductance and electron transport rate of three Japanese rice cultivars including Himenorin in Ehime Prefecture

“…Among a variety of countermeasures to prevent heat damage, Morita et al (2016) concluded that using heat-tolerant rice cultivars is one effective measure. In addition to finding existing heat-tolerant cultivars, quite a number of new cultivars have been developed such as Koshiibuki (Hoshi et al, 2002), Ten-takaku ( Yamaguchi et al, 2006), Nikomaru ( Sakai et al, 2007), and Himenorin ( Minakuchi et al, 2019). In terms of heat tolerance of rice after heading, Koshihikari has long been recognized as one of the tolerant or moderately tolerant rice cultivars ( Nishimura et al, 2000;Hoshi et al, 2002;Wakamatsu et al, 2007).…”

“…In terms of heat tolerance of rice after heading, Koshihikari has long been recognized as one of the tolerant or moderately tolerant rice cultivars ( Nishimura et al, 2000;Hoshi et al, 2002;Wakamatsu et al, 2007). Nikomaru is also categorized as moderately tolerant ( Wakamatsu et al, 2007;Sakai et al, 2007) to high-temperature stress.…”