Optimizing Sowing Date and Nitrogen Fertilizer Level for the New Rice Variety Sakha Super 300

Abstract

A field trial was performed in Randomized Complete Block Design (RCBD) with three replications at the Experimental Farm of Sakha Agricultural Research Station, Kafr ELSheikh, Egypt, during 2018 and 2019 rice growing seasons, to investigate the effect of three sowing dates (May 10 th , June 1 st and June 20 th) and four levels of nitrogen fertilizer (0, 55, 110 and 165 kg N/ha) on the productivity of Sakha Super 300 variety. The results showed that the sowing date June 1 st produced the highest grain yield 10.67 and 10.71 t ha-1 in both seasons. Nitrogen level of 165 kg N ha-1 produced the highest grain yield 10.50 and 10.45 t ha-1 without any significant difference with level of 110 kg N ha-1 in 2018 and 2019 seasons. The interaction between sowing dates and nitrogen levels was highly significant for number of panicles hill-1 , panicle length, number of filled grains panicle-1 , unfilled grains percentage and 1000-grain weight, as well as grain and straw yield and harvest index in both seasons. Interaction results showed that, the first sowing date (May 10 th) with nitrogen level of 110 kg N ha-1 gave the highest grain yield 10.91 and 10.79 t ha-1. On the other hand the second sowing date (June 1 st) with nitrogen level of 165 kg N ha-1 gave the highest grain yield 12.03 and 11.92 t ha-1 in 2018 and 2019 seasons. The highest values of accumulated growing degree days (GDD) and photo thermal units (PTU) were recorded when plants sown on May 10 th. On the other hand the maximums heat use efficiency (HUE) was achieved when Sakha Super 300 sown on 1 st June with application of 165 Kg N ha-1 in both seasons.

Azolla Compost as an Approach for Enhancing Growth, Productivity and Nutrient Uptake of Oryza sativa L.

“…These striking results are perhaps attributed to the dual effect of organics and inorganics on providing a nutritious soil for plant growth that achieves generational photosynthetic outputs and more efficient distribution to developmental organs. Our findings were in line with those obtained by [51][52][53][54].…”

Utilizing Urea–Chitosan Nanohybrid for Minimizing Synthetic Urea Application and Maximizing Oryza sativa L. Productivity and N Uptake

“…In this context, CS-urea NH might have compensatory benefits in the case of supplemental fertilizer (N) deficiency. In another agronomic view, the abovementioned findings are perhaps related to higher N-use efficacy of the cultivated variety (Sakha super 300) as reported by [61], as well as related to the importance of CS-urea NH as a slow-release source of nutrients.…”