Effect of Seedling Quality and Transplanting Density on Yield, Yield Components, and Biochemical Properties in the Main and Ratoon Culture of Rice

The field experiment has been conducted as a split split plot based on a randomized complete block design with three replicaitons at Rice Research Institute of Mazandaran Province, Amol, in 2017. In this experiment, the seeds are sown in seedling box with different six bed treatments. These beds include S1: sulfur bed with 50% rice bran, S2: sulfur-free soil with 25% rice bran, S3: sulfur bed with 25% rice bran, S4: sulfur bed with Thiobacillus and 50% rice bran, S5: sulfur-free bed with wood compost and 25% rice bran, and S6: sulfur bed with Thiobacillus with 25% bran rice. After some measurements, the seedling is transplanted in the main field. In the field, different beds in box, seedling number per hill (3 and 5) and planting space (20×20 cm, 30×14cm) are assigned to the main plot, sub plot, and sub sub plot, respectively. The results of main cultivation show that the highest grain yield (5043 kg.ha-1) and biological yield (12319 kg.ha-1) are obtained from the treatment of bed soil with sulfur with 50% bran. Planting arrangement treatment in ratoon cultivation on number of hollow seeds (4.1), grain yield (1617 kg.ha-1), number of plants per hill treatment on number of tillers (10.3), leaf area (10.6 cm2), panicle length (20.4 cm) and grain yield (1613 kg.ha-1), and seedling type treatment on tiller number (10.4) show a statistically significant difference. Seedling grown in sulfur with 50% rice brain display the best performance in terms of yield and yield components in both main and ratoon cropping.