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Farmers' Perception and Evaluation of Brachiaria Grass

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Farmers' Perception and Evaluation of Brachiaria Grass agriculture Article Farmers’ Perception and Evaluation of Brachiaria Grass (Brachiaria spp.) Genotypes for Smallholder Cereal-Livestock Production in East Africa Duncan Cheruiyot 1,2,* , Charles A.O. Midega 1, Jimmy O. Pittchar 1, John A. Pickett 3 and Zeyaur R. Khan 1 1 International Centre of Insect Physiology and Ecology (icipe), P.O. Box 30772, Nairobi 00100, Kenya; [email protected] (C.A.M.); [email protected] (J.O.P.); [email protected] (Z.R.K.) 2 Department of Biological Sciences, Faculty of Science and Technology, University of Kabianga, P.O Box 2030, Kericho 20200, Kenya 3 School of Chemistry, Cardiff University, Cardiff CF10 3AT, UK; PickettJ4@cardiff.ac.uk * Correspondence: [email protected] Received: 27 May 2020; Accepted: 24 June 2020; Published: 4 July 2020 Abstract: Brachiaria (Urochloa) is a genus, common name brachiaria, of forage grasses that is increasingly transforming integrated crop-livestock production systems in East Africa. A study was undertaken to (i) assess smallholder farmers’ perception on benefits of brachiaria in cereal-livestock production, (ii) identify brachiaria production constraints, and (iii) identify farmer preferred brachiaria genotypes. A multi-stage sampling technique was adopted for sample selection. Data were collected through semi-structured individual questionnaire and focus group discussions (FGDs). The study areas included Bondo, Siaya, Homabay and Mbita sub-counties in Western Kenya and the Lake zone of Tanzania. A total of 223 farmers participated in individual response questionnaires while 80 farmers participated in the FGDs. The respondents considered brachiaria mainly important in management of cereal pests (70.4% of respondents) and as an important fodder (60.8%). The major production constraint perceived by both male and female respondents is attacks by arthropods pests (49.2% and 63%, respectively). Spider smites had been observed on own farms by 50.8% of men and 63.1% of women, while sorghum shoot flies had been observed by 58.1% of men and 67.9% of women. These pests were rated as a moderate to severe problem. Xaraes was the most preferred genotype, followed by Mulato II and Piata. These genotypes are important in developing new crop pest management strategies, such as push-pull, and for relatively rapid improvements in crop management and yield increases, particularly in developing countries. Keywords: brachiaria; cereal-livestock production; perception; push-pull technology; smallholder farmers 1. Introduction Brachiaria (Urochloa) is a genus in Poaceae family commonly called brachiaria and grown for forage in Latin America, Asia, South Pacific, and Australia [1]. A widely grown species Brachiaria brizantha represents 85% of cultivated pastures in brazil alone [2]. In Africa, where they originate from, they are natural constituents of grasslands in eastern, central, and southern regions [3]. Brachiaria is recently identified as an ideal fodder that can improve livestock production in eastern Africa. This is due to its adaptability to low fertility areas, arid, and semiarid zones of sub-Saharan Africa [3]. There are several initiatives in the region aimed at promoting cultivation of brachiaria to support the emerging livestock industry [4]. Agriculture 2020, 10, 268; doi:10.3390/agriculture10070268 www.mdpi.com/journal/agriculture Agriculture 2020, 10, 268 2 of 13 A reduction of fall armyworm, (Spodoptera frugiperda) damage was recently observed in push-pull technology (PPT) plots as compared to farmers’ practice [5]. Furthermore, desmodium enhances soil integrity. Further, Brachiaria cv. Mulato II is an important companion crop used as a trap plant in a push-pull technology (PPT, www.push-pull.net). Developed by International Centre of Insect Physiology and Ecology (icipe, Nairobi, Kenya), Rothamsted Research (Harpenden, UK), and national partners, PPT is a conservation agriculture system for integrated pest, weed, and soil fertility management in crop–livestock farming systems [6,7]. The system involves intercropping the main crop, either maize Zea mays L. or sorghum Sorghum bicolor (L.) Moench with a fodder legume, silverleaf desmodium Desmodium uncinatum (Jacq.) DC., and surrounded with Napier grass, Pennisetum purpureum [8]. The climate smart variant uses drought tolerant green leaf desmodium, Desmodium intortum (Mill.) Urb., and brachiaria B. brizantha cv Mulato II as the border crop [9,10]. Desmodium releases chemicals that repel stemborers, while volatile chemicals from Napier grass or brachiaria attract the insects and their natural enemies. Through this chemistry, PPT significantly reduces the infestation of cereal stemborers Busseola fusca (Fuller) (Noctuidae) and Chilo partellus Swinhoe (Crambidae) [10–13]. Significant through nitrogen fixation improves soil organic content and conserves the soil moisture [14,15]. Root exudates of desmodium cause the abortive germination of a noxious weed striga Striga haemonthica, therefore providing additional benefits in weed management [11]. On the other hand, brachiaria is a high-value forage crop that facilitates milk production and diversifies farmers’ sources of income. A recent study shows that B. brizantha cv Piata has higher content of dry matter, crude protein, and organic matter than Napier grass [16]. Some species of brachiaria reduce emission of nitrous oxide from the soil through biological nitrification inhibition [17,18]. Agriculture is an economic mainstay in most developing countries of the tropics. It is characterized by smallholder mixed crop-livestock systems where rain-fed crops and livestock are raised on the same farm [19]. In sub-Saharan Africa (SSA), smallholder farming is a major source of food production and income, contributing up to 80 percent of food consumed [20]. Crops mostly cultivated in the region are, in order, maize, cassava, rice, sorghum, wheat, and millet, while livestock species include cattle, goats, and sheep [19]. However, production in the region is constrained by climate change related biotic and abiotic constraints, including pests and disease outbreaks, extreme weather conditions, among others. This poses a threat to food security and livelihood in communities dependent on agriculture [21,22]. More than 250,000 smallholder farmers in sub-Saharan Africa have used push-pull technology to manage stemborers, fall armyworm, noxious Striga weeds, and soil fertility, and to generate livestock fodder [23]. The value of brachiaria to African agriculture observed thus far can be optimized by addressing the current and foreseeable production constraints. Yet, the few genotypes that are commercialized in Africa were developed for the Americas and Australia thus a higher risk of pest and disease attacks, coupled with poor adaptability to local environments. There is, remarkably, a wide genetic variation in the genus Brachiaria [24] that can be exploited in breeding programs for locally adapted genotypes. Recent studies identified brachiaria genotypes that combine drought tolerance and moderate resistance to spider mites [25,26]. Among these genotypes, some are attractive to oviposition by stemborer moths while being detrimental to the larvae of the pest, thus valuable in push-pull technology [27]. These genotypes could be of value in the improvement of cereal livestock-based livestock productivity in sub-Saharan Africa in the current scenarios of increasing aridification and attacks by invasive pests, such as spider mite (Oligonychus trichardti). However, farmers’ skills and knowledge can complement scientific research and their contribution through participatory approach is key in validating the potential of such genetic materials. Therefore, this study aimed at (i) assessing smallholder farmers’ perception on benefits of brachiaria in cereal-livestock production, (ii) assessing brachiaria production constrains, and (iii) identifying farmer preferred brachiaria genotypes. 2. Materials and Methods 2.1. Study Area Arid and semi-arid areas of western Kenya and the lake zone in Tanzania were selected because of their importance in cereal-livestock based farming systems. The study areas in Kenya included Agriculture 2020, 10, 268 3 of 13 Homabay, Mbita, Bondo, and Siaya. The lake zone in Tanzania (hereafter referred to Tanzania LZ) included Tarime and Mwanza districts. Rainfall pattern is bi-modal, main season runs from March to August and the short season is from October to January. Farming systems in the regions are predominantly cereal/edible legume integrated with livestock [6]. These areas are historically hot spots for cereal stemborer, and most farmers have widely adopted push-pull technology (PPT) as a management tool for the pest [5]. Further, the areas are characterized by extended periods of drought, which makes them conducive for the invasive spider mite, O. trichardti. Spider mite is the most important pest of brachiaria, a companion crop in PPT, especially during drier and hotter regimes [26]. These study areas are therefore ideal for assessment of farmers’ experience and preference of brachiaria genotypes for use in cereal-livestock production. 2.2. Demonstration Plots One site per study area was selected for the establishment of the demonstration plots for six brachiaria genotypes. This was purposely done by ensuring that they occur in different agro-ecologies, as follows; Homabay (Lower Midland 3), Mbita (Lower midland 5), Bondo (Lower midland 4), and Siaya (Lower midland 2) [28]. The lake zone sites in Tanzania included Tarime (high altitude plateau) and Mwanza (medium
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