Carrot yield and water-use efficiency under different mulching, organic fertilization and irrigation levels

Abstract

This study was carried out to evaluate the contributions to the optimization of water use in a carrot crop under different forms of mulch using Gliricidia sepium, fertilization with castor bean cakes and irrigation water depths. The experiment was conducted in Seropédica, RJ, Brazil (22º 46’ S and 43º 41’ W), from June to September 2010. The experiment was conducted using a split-split-plot scheme (5 x 3 x 2), with four replicates. The five plots had irrigation depths corresponding to 0, 43, 72, 100 and 120% of crop evapotranspiration (ETc); the three subplots contained the different forms of mulch (whole leaves (WL) and chopped leaves and branches (CLB)) and the absence of mulch (AM); and the two sub-subplots contained either the presence (PF) or absence of fertilization (AF). Using time domain reflectometry (TDR) in the irrigation management, water depths ranging from 67.8 to 285.5 mm were applied. The use of mulch in association with fertilization led to higher yields and water-use efficiency (WUE) of the carrot plants, and the mulch composed of WL performed best. The application of irrigation depths corresponding to 97% of ETc promoted the highest carrot yields, although the highest values of WUE were observed, with irrigation depths corresponding to a range from 51 to 68% of ETc.

Irrigation Management and Biodegradable Mulching Impact on Carrot Biometric Characteristics and Yield

“…Furthermore, the root length was not significantly affected by the irrigation depths, which differs from the results found by Reid & Gillespie (2017) and Carvalho et al (2018). This difference was probably due to the contribution of rainfall in the experimental periods of this research (Fig.…”

Controlled water stress in agricultural crops in brazilian cerrado

“…For the two materials tested, the authors verified a reduction in productivity due to the reduction of soil water content, showing the importance of the water management of this crop. Carvalho et al (2018) verified that the application of an irrigation depth corresponding to 100% replacement of crop evapotranspiration led to the highest productivity (70 Mg ha -1 ) of carrot roots, Brasília cultivar. In the treatments with smaller (43 and 72% of ETc) and larger (120% of ETc) irrigation depths, the authors verified lower productivities.…”

Decomposição de esterco bovino e de biomassa de Gliricídia sepium em Neossolo Regolítico

“…Os resultados mostram que a decomposição e liberação de nutrientes do esterco acontecem de forma mais lenta em relação a da biomassa de gliricídia quando incorporada ao solo, estando de acordo com outros estudos, que avaliaram a decomposição de adubos verdes e esterco (PALM et al, 2001;COBO, et al, 2002;VANLAUWE et al, 2005;SILVA, MENEZES, 2007;CARVALHO et al, 2018;SIERRA et al, 2018). De acordo com Palm et al (2001), a decomposição mais lenta do esterco, quando comparada a adubos verde e material vegetal, ocorre porque o esterco apresenta menores teores de N e maiores teores de lignina e polifenóis do que os adubos verdes, conferindo menor qualidade em relação às outras fontes orgânicas de nutrientes.…”