Agronomic efficiency and grain quality of upland rice cultivars as a function of nitrogen topdressing

Abstract

ABSTRACT:This study aimed to evaluate the agronomic efficiency and grain quality of rice cultivars as a function of nitrogen application in upland conditions with supplemental sprinkler irrigation. The experiment was carried out in 2012/13 at Jaboticabal-SP on a randomized block and split plots design with four replications. The plots were composed of twelve rice cultivars (BRS Aroma, BRS Monarca, BRS Primavera, BRS Sertaneja, BRSMG Curinga, Caiapó, CIRAD 141, Guarani, IAC 165, IAC 201, IAC 202, and IAC 25), and two levels of nitrogen application (0 and 100 kg of N ha -1 ) in topdress at the R 1 stage (panicle differentiation) as subplots. The N application intensifies the degree of lodging, mainly at Caiapó, Guarani, IAC 165, IAC 201 and IAC 25 cultivars. The N application affects the number of sterile spikelets per panicle, mainly in CIRAD 141, BRS Sertaneja, IAC 202, and BRS Aroma cultivars. Caiapó cultivar shows higher grain yield and agronomic efficiency in function of N application, followed by BRS Monarca, BRSMG Curinga, IAC 165, and IAC 202. Although Caiapó, CIRAD 141, Guarani, IAC 165, IAC 202, and IAC 25 cultivars present better results, all the others cultivars also present acceptable values of milling yield, without N application effects. The grain protein content in rice is increased by the N topdressing application.

Effects of arbuscular mycorrhizal fungi inoculation on carbon and nitrogen distribution and grain yield and nutritional quality in rice (Oryza sativa L.)

“…), which improved the overall nutritional quality of seeds. This is partly in agreement with the results presented by Mingotte et al , who found that N topdressing promoted N translocation in the form of grain protein and grains of a higher nutritional value. On the other hand, the C:N ratio of the inoculated seeds decreased.…”

Effects of Nitrogen and Shading on Root Morphologies, Nutrient Accumulation, and Photosynthetic Parameters in Different Rice Genotypes

“…N fertilizer application considerations have been an effective production input which contributes significantly to rice yield improvement 7 8 . N topdressing application has been found to increase grain protein content and head yield in rice 9 10 11 . However, an excessive input of chemical fertilizer in rice production often leads to a series of environmental problems 12 13 14 .…”

September 2020

“…As N uptake depends on the growth rate of tissues, strategies to increase biomass before anthesis may represent a mechanism to increase the protein content of grains without restriction to grain yield (Finnan et al, 2019). Several studies have related N availability to increase protein and grain quality of wheat (Stefen et al, 2014;Rial-Lovera et al, 2016), maize (Nelson et al, 2009) and rice (Mingotte et al, 2015). For human diets, there is a preference for low-fat and protein-rich and fiber-rich grains, especially β-glucans related to reduction of cholesterol and blood sugar and weight loss (Hooda et al, 2010).…”