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Exploiting Olive Mill Byproducts and Other Waste for Organic Weed Management

1
Horticulture and Crop Science Department, California Polytechnic State University, San Luis Obispo, CA 93407, USA
2
Undergraduate student, California Polytechnic State University, San Luis Obispo, CA 93407, USA
*
Author to whom correspondence should be addressed.
Horticulturae 2019, 5(3), 59; https://doi.org/10.3390/horticulturae5030059
Received: 15 June 2019 / Revised: 6 August 2019 / Accepted: 8 August 2019 / Published: 9 August 2019
(This article belongs to the Special Issue Weed Management in Horticultural Production)
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Abstract

Weed management represents one of the most serious and costly challenges in organic crop production systems. Agricultural waste/byproducts might present phytotoxicity that can be exploited to control weeds. Two experiments were designed to study the effects of four concentrations of olive vegetation water (OVW) and a control water treatment (with no OVW) on cheeseweed (Malva parviflora L.) seed germination in petri dishes and pots. In a third experiment, two rates of four composts (crop residue mix (CR), olive pomace (OP), dairy/horse manure (DM), and an OP/DM mix) were mixed into a clay‒loam soil at 0.10 or 0.20 L L−1, to assess their effects on weed number and biomass, in addition to bell pepper (Capsicum annuum L.) growth. In the petri dish experiment, the three highest OVW concentrations completely prohibited germination during the five-week duration of the study. For the pot experiment, 25 mL application of OVW significantly delayed and reduced cheeseweed germination, with the reduction being proportional to the concentration of OVW. In the third experiment, composts reduced weed dry matter (composed mostly of purslane (Portulaca oleracea L.)), with the CR compost being the most effective, reducing total weed biomass by 67% compared to the control. CR10 and DM10 tended to increase bell pepper yields, although none of the plant parameters was significantly affected by the compost treatments.
Keywords: olive vegetation water; olive mill wastewater; olive pomace; manure compost; weeds; organic agriculture; germination; Malva parviflora L.; Portulaca oleracea L. olive vegetation water; olive mill wastewater; olive pomace; manure compost; weeds; organic agriculture; germination; Malva parviflora L.; Portulaca oleracea L.
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Tubeileh, A.M.; Schnorf, J.T.; Mondragon, I.; Gray, G.A. Exploiting Olive Mill Byproducts and Other Waste for Organic Weed Management. Horticulturae 2019, 5, 59.

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