Nitrogen and silicon fertilization of upland rice

Munir Mauad, Carlos Alexandre Costa Crusciol, Hélio Grassi Filho, Juliano Corulli Corrêa
2003 Scientia Agricola  
Silicon is not considered an essential element for plant development and growth, but its absorption brings several benefits to some crops, especially rice, by increasing cellular wall thickness, providing mechanical resistance to the penetration of fungi, improving the opening angle of leaves and making them more erect, decreasing self-shading and increasing resistance to lodging, especially under high nitrogen rates. To evaluate the effects of nitrogen and silicon fertilization on vegetative
more » ... ion on vegetative and yield components, plant height, and yield of rice cultivar IAC 202, an experiment was carried out combining three nitrogen rates (5, 75 and 150 mg N kg-1 soil) applied as urea, and four silicon rates (0, 200, 400 and 600 mg SiO2 kg-1 soil) applied as calcium silicate. Trial was set up in a completely randomized design 3 ´ 4 factorial scheme, (N = 5). Nitrogen fertilization increased the number of stems and panicles per square meter and the total number of spikelets, reflecting on grain productivity. Excessive tillering caused by inadequate nitrogen fertilization reduced the percentage of fertile stalks, spikelet fertility and grain mass. Silicon fertilization reduced the number of blank spikelets per panicles and increased grain mass, but did not affect grain productivity.
doi:10.1590/s0103-90162003000400023 fatcat:fycgjyzx4jdcncrx4pj7jqv4lq