Mohammad Rabiee, Sajjad Shaker-Kouhi,
Volume 16, Issue 62 (11-2024)
Abstract
In order to investigate the effects of nitrogen levels, planting and tillage methods on the dry matter remobilization and current photosynthesis in rapeseed (Brassica napus L.) in paddy field conditions, a split factorial experiment in complete randomized block design was conducted with three replications at research fields of Rice Research Institute of Iran in Rasht during two cropping seasons of 2016-2018. In this experiment, three tillage systems (conventional tillage, minimum tillage and no-tillage) were considered as main plots and two planting methods (direct and transplanting) and four rates of nitrogen (N) fertilizer from urea source (0, 100, 200 and 300 kg.ha-1) as factorial arrangement in subplots. The results showed that the second year of the experiment had the maximum dry matter remobilization (583.96 g.m-2), current photosynthesis (2764.68 g.m-2) and grain yield (3348.6 Kg.ha-1). The dry matter remobilization, remobilization efficiency, share of remobilization and grain yield for the transplanting method was higher than the direct seeding method. Among the N levels, the treatments of 200 and 300 kg.ha-1 had the highest dry matter remobilization, current photosynthesis and grain yield. Based on the results of this experiment, minimum tillage system with 200 kg.ha-1 of N in transplanting method can increase dry matter remobilization, current photosynthesis and grain yield of rapeseed in paddy fields of Guilan province.
