بررسي تاثير جهت هاي كاشت (شمال- جنوب و شرق- غرب ) با ماشين نشاكار بر عملكرد و اجزاي عملكرد ارقام مختلف برنج

Study on the effect of planting directions (North-South and East-West) with transplanter machine on yield and yield components of different rice cultivars

Because of high labor cost and thus increasing of product ion cost, one of important ways for decr esing of the mentioned costs in rice production is transplanting with machine. Rice cultivars show different responses to planting direct ion in interception of indirect light . In order to study the effe ct of planting directi ons with transplanter machine on yield and yield components of different rice cultivars, an experiment was conducted at Rice Research Institute of Iran (Deputy of Mazandaran-Amol) during 2000·2001. The experiment was arranged in randomized complete block design with three rep lications in which planting directions (north- south and east-west) and cultivars (Tarom , Fajr and Sahel) were the trea tmen t. Results showed that the effect of planting directi ons on plant heigh t, tiller number, number of grain s per panicle, panicle length , filled grains, unfilled grains and yield was not significant at 0.05 probablity level , but amo ng the cultivars, Fajr and Sahel in contrast to Tarom had greater grain yield in east-west than north -south planting direction. Among the genotypes Sahel and Tarom had greatest and lowe st grain yield, respectively. The interaction between year and cultivar showed that cultivars had different grain yield in two years in which , in the second year grain yield was 29.5 % greater than the first year. Results showed that rice cultivars had different response to planting directions, in which east-west and north -south is recommended for low yielding and high yielding cultivars respe ctively.