Abstract
PurposeRice husk is one of the most widely available agricultural wastes in many rice producing countries of the world. Here, we evaluated carrot production under different rice husk-amended media aimed at providing alternative use for rice husk.MethodsThe experimental design was 2 × 5 × 4 factorial in completely randomized design with six replications. Factor A consist of two production environments—high tunnel and open field while factor B was five growth media—5:0:0, 4:0:1, 3:1:1, 2:2:1 and 1:3:1 (topsoil:rice husk:poultry manure). Factor C was four carrot varieties; ‘Touchon’, ‘Amazonia’, ‘Carrot New Kuroda’ and ‘Touchon Mega’. Data were collected on seedling emergence and yield parameters. The analysed means were separated using FLSD(0.05).ResultsThe biomass yield from plants grown in high tunnel was significantly higher than plants in the open field. Highest root weight, wet and dry biomass yield were obtained from medium 4:0:1 followed by 3:1:1. Harvest index ranged from 32.3% in medium 1:3:1 to 62% in 3:1:1. Days to seedling emergence among varieties ranged from 8.5 to 11.3. ‘Amazonia’ variety produced the highest root weight, wet and dry biomass yield and was followed by ‘Touchon Mega’.ConclusionCarrot seedling emergence and yield differed in rice husk-amended media under high tunnel and open field environments. ‘Amazonia’ variety grown in media 4:0:1 or 3:1:1 gave the best yield. Inclusion of rice husk in media formulation beyond an optimum rate resulted in yield reduction in carrot. Carrot is sensitive to the physio-chemical properties of its growth medium.
Highlights
IntroductionAdubasim et al (2018) observed positive effect of rice husk in enhancing pH, organic matter, magnesium and available phosphorus as an aerator in media formulation
Increased agricultural production over the years has come at the expense of the ecological sustainability (Yu and Wu 2018) as tons of agricultural wastes are generated from farm1 3 Vol.:(0123456789) S400International Journal of Recycling of Organic Waste in Agriculture (2019) 8 (Suppl 1):S399–S406Adubasim et al (2018) observed positive effect of rice husk in enhancing pH, organic matter, magnesium and available phosphorus as an aerator in media formulation
Our study showed that carrot is sensitive to the physiochemical properties of its growth medium
Summary
Adubasim et al (2018) observed positive effect of rice husk in enhancing pH, organic matter, magnesium and available phosphorus as an aerator in media formulation. The study did not establish the impact on the media if the aerator (rice husk) quantity was to be increased or decreased. In Nigeria, there is high acceptance of carrot root with production common in northern Guinea Savannah and Sudan ecologies where there is drier weather. The modification of plant growth environment to increase its production area can occur naturally through evolution and climate change or artificially by erection of protected structures. Protected structures like high tunnels provide organic and conventional growers with an economic means for extending the harvest season of fresh fruits and vegetables in a wide range of climate zones (Gu et al 2017)
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