Abstract
Pequi waste added to soil can lead to promising results in the management of plant nematodes. This study evaluated the effect of organic compost of pequi fruit waste in the control of Meloidogyne javanica in okra plants. The compost was comprised of cattle manure, sugarcane straw, and pequi rind waste in the ratio 1:1:1. Treatments were five doses of organic compost (0, 5, 10, 20, and 30 g dm-3) and two additional controls: manure (20 g dm-3) and mineral fertilizer (100 mg dm-3 of N), arranged in randomized block design with 10 repetitions. Different treatments were incorporated into pots containing 3 dm-3 of sandy soil infested with 5,000 eggs of M. javanica. Seedlings were transplanted five days later, and evaluated after 60 days of transplanting. Organic compost with pequi waste incorporated to soil increased shoot dry weight and root weight, and reduced the number of egg masses, galls and eggs of M. javanica per gram of root, and reproduction factor. Doses of 20 and 30 g dm-3 increased plant development and reduced the reproductivity of M. javanica compared to mineral fertilizer.
Highlights
Okra (Abelmoschus esculentus L.) is a vegetable grown throughout the year in warm regions at relatively low cost, which is often a good alternative source of farmers’ income (Oliveira et al, 2007)
Various bioactive nematicides have been described in the literature, such as glucosinolates in Brassica species, azadirachtin in neem (Azadirachta indica), and composts released from waste of Tagetes spp. and Mucuna spp. (Neves et al, 2007; Osei et al, 2010; Nile et al, 2018)
Plants were grown for 60 days and we evaluated height of plants, shoot dry weight, fresh root weight, and variables related to reproduction of M. javanica: number of egg masses, galls and eggs per gram of root, and number of second stage juveniles (J2) in the soil
Summary
Okra (Abelmoschus esculentus L.) is a vegetable grown throughout the year in warm regions at relatively low cost, which is often a good alternative source of farmers’ income (Oliveira et al, 2007). This study evaluated the effect of pequi waste organic compost on the control of M. javanica and development of okra plants. Plants were grown for 60 days and we evaluated height of plants, shoot dry weight, fresh root weight, and variables related to reproduction of M. javanica: number of egg masses, galls and eggs per gram of root, and number of second stage juveniles (J2) in the soil.
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