Seed Dispersal by Frugivores and Germination Success of the Invasive Alien Shrub Pyracantha Angustifolia in the Eastern Free State Province, South Africa

Invasive alien plants can use animal-plant interactions to increase their invasiveness. This study investigated the role of frugivorous birds in seed dispersal and germination of the alien plant Pyracantha angustifolia (Rosaceae) in South African high elevation grasslands. We monitored which bird species fed on the fruit of the invasive P. angustifolia in some farms in the Eastern Free State Province using camera-traps and direct surveillance. Nine bird species visited P. angustifolia shrubs to perch or feed on fruits, but only one bird (Speckled Mousebird) fed on the fruits during timed observations. To assess the effect of ingestion by avian frugivores on P. angustifolia germination, P. angustifolia fruits were fed to captive Cape White-eyes (Zosterops virens), Dark-capped Bulbuls (Pycnonotus tricolor), Purple-crested Turacos (Gallirex porphyreolophus), Red-winged Starlings (Onychognathus morio) and Speckled Mousebirds (Colius striatus). Seeds collected from bird excreta, whole fruits, and depulped fruits were grown under greenhouse conditions and germination rates recorded. All captive bird species, except for Cape White-eyes, ingested the seeds; Cape White-eyes only fed on fruit pulp that they had manually removed. Bird species with relatively larger body mass had longer seed retention times compared with the smaller bird species. Germination success of both depulped and ingested P. angustifolia seeds was high (> 80%) and that of whole fruits low (7%). Ingestion by the four avian frugivore species did not affect germination rate and success; instead, the birds facilitate the spread and germination of seeds by removing the fruit pulp and spreading the seed away from the parent shrubs.

Synergy Of Soil Fertilization And Pollination For Sunflowers

In order to harness the potential of ecological intensification during sunflower cropping, it is crucial to understand the potential synergies between crop management and ecosystem services. We therefore examined the effect of differing pollination intensification on sunflower yield and productivity under various levels of soil fertilization during 2017/18 and 2018/19 seasons in the eastern Free State, South Africa. We manipulated soil fertility with fertilizer treatments and used exclusion bags to manipulate pollination exclusion intensity. We found a synergetic effect between pollination and soil fertilization whereby high pollination intensity produced a far higher impact on sunflower yield when the soil had been fertilized.

Synergy Of Soil Fertilization And Pollination For Sunflowers

In order to harness the potential of ecological intensification during sunflower cropping, it is crucial to understand the potential synergies between crop management and ecosystem services. We therefore examined the effect of differing pollination intensification on sunflower yield and productivity under various levels of soil fertilization during 2017/18 and 2018/19 seasons in the eastern Free State, South Africa. We manipulated soil fertility with fertilizer treatments and used exclusion bags to manipulate pollination exclusion intensity. We found a synergetic effect between pollination and soil fertilization whereby high pollination intensity produced a far higher impact on sunflower yield when the soil had been fertilized.

Factors Determining the Adoption of Strategies Used by Smallholder Farmers to Cope with Climate Variability in the Eastern Free State, South Africa

This study was undertaken to understand the smallholder farmer’s perception of the effects of climate variability, their adaptation strategies to cope with climate variability and factors determining the adoption of their adaptation strategies in the eastern Free State Province of South Africa. Adaptation strategies were grouped into two categories, i.e., traditional adaptation strategies and scientific adaptation strategies. Traditional adaptation strategies consisted of practices that require minimal technical expertise and less external inputs such as changing from crops to livestock, crop diversification, increasing land under production, changing crop type and water harvesting. Scientific adaptation strategies consisted of practices that require additional external inputs, labour, and some level of technical expertise such as changing crop variety, improving soil fertility and soil conservation. Data were collected from 391 smallholder farmers using a structured household questionnaire and were verified through focus group discussion meetings with key informants. Data were analysed using the descriptive statistics, frequency analysis and a binary logistic model. Results indicated that the majority of smallholder farmers perceived that climate change had triggered food-related impacts in the study area and had adopted at least one adaptation strategy. This study showed that awareness and knowledge were the key factors that determined the adoption of traditional adaptation strategies in the study area. The adoption of scientific adaptation strategies was additionally determined by the availability of external financial investments. It is recommended that the promotion of traditional practices should focus on raising awareness of climate change and adaptation strategies while the promotion of scientific practices additionally requires the provision and accessibility of financial institutional support and incentives.

Barriers Affecting Sustainable Agricultural Productivity of Smallholder Farmers in the Eastern Free State of South Africa

Sustainable Agricultural Practices (SAPs) are the most promising pathways to enhance the productivity and resilience of agricultural production of smallholder farming systems while conserving the natural resources. This study was undertaken to identify the barriers affecting sustainable agricultural productivity of smallholder farmers in the eastern Free State, South Africa. Data were collected from 359 smallholder farmers using questionnaires and the validity of the collected data was confirmed through focus group discussions with key informants. Descriptive statistics and a binary logistic regression model were used to analyze data. Results indicated that traditional SAPs such as intercropping, mulching and crop rotation were more likely to be adopted by farmers with access to land yet without access to credit (and had low levels of education, although this finding was not significant). In contrast, new SAPs such as cover cropping, minimum-tillage, tied ridging and planting pits were more knowledge (education), capital and labor intensive. Therefore, extension strategies should take these differences into consideration when promoting both the adoption of traditional SAPs and new SAPs. Targeting resource-constrained farmers (in terms of access to credit and education) through raising awareness and building capacity is essential to ensure the adoption of traditional SAPs. In turn, promoting the adoption of new SAPs not only needs awareness raising and capacity building but also must fundamentally address resource constraints of South African smallholder farmers such as knowledge, capital and labor. It is recommended that government should provide resources and infrastructure to improve the quality and outreach of extension services through field demonstration trials and training.

Differences in Bacterial Diversity, Composition and Function due to Long-Term Agriculture in Soils in the Eastern Free State of South Africa

Land-use change from natural to managed agricultural ecosystems significantly impacts soil bacterial diversity and function. The Eastern Free State (EFS) is one of the most productive agricultural regions in South Africa. However, no studies aiming to understand the changes in bacterial diversity, composition and function due to land-use change in this area have been conducted. This study investigated, using high-throughput 16S rRNA gene amplicon sequencing, the effects of long-term agriculture on bacterial diversity, composition and putative function in the EFS by comparing microbiomes from lands that have been under agronomic activity for over 50 years to those from uncultivated land. Results indicate that agriculture increased bacterial diversity. Soil chemical analysis showed that land-use shifted soils from being oligotrophic to copiotrophic, which changed bacterial communities from being Actinobacteria dominated to Proteobacteria dominated. Predictive functional analysis using Phylogenetic Investigation of Communities by Reconstruction of Unobserved States (PICRUSt) suggested that agricultural soil was abundant in genes associated with plant fitness and plant growth promotion, while non-agricultural soil was abundant in genes related to organic matter degradation. Together, these results suggest that edaphic factors induced by long-term agriculture resulted in shifts in bacterial diversity and putative function in the EFS.