Research Papers/Topics in Agronomy

Effects of Retention Period on Field Emergence, Seed Vigour And Genetic Purity of Soybeans (glycine max. L).

ABSTRACT Access to high quality certified soybeans seeds by most small scale commercial farmers is a major constraint and this result in most farmers to retain their seed obtained from the previous harvests. The aim of this study was to assess the effects of retention period on field emergence, vigor and genetic purity of soybean seeds under the smallholder farmers in semi arid regions of Zimbabwe. A survey was first conducted to assess the agronomic and storage practices done by smallh...

Potential of brassica napus and trichoderma harzianum in control of powdery scab (spongospora subterranea f.sp.subterranea.) Of potato (solanum tuberosum l.)

ABSTRACT Potato (Solanum tuberosum L.) is one of the most important crops grown in Zimbabwe owing to its nutritional and economic benefits. However, its production is often adversely affected by soilborne fungal pathogens such as Spongospora subterranea f.sp subterranea, the causal agent of powdery scab on potato tubers and the vector of Potato Mop Top Virus. The fungal pathogen forms root galls on roots and lesions on tubers. Brassica crops incorporated in crop rotations or applied...

Effect Of Calcium Fertilization On Soft Rot (Pectobacterium Carotovora) Disease Development In Irish Potato (Solanum Tuberosum

ABSTRACTPotato production is being affected by many bacterial and fungal diseases hence most farmers incur heavy pre and post-harvest losses. Among the bacterial diseases soft rot is one of the most severe disease. Soft rot is a potato disease caused by bacteria called Pectobacterium carotovora. lt is a seed borne disease and it is difficult to control. The research focuses on increasing resistance of potato to soft rot disease. The experiment was conducted at Africa University campus during ...

Effects Of Foliar Fertilisers Containing Magnesium, Copper And Zinc On Yield And Quality Of Mature Tea.

ABSTRACTTea plantations of Southdown estate are deficient in nutrients such as Copper, Magnesium, and Zinc. This was shown by leaf analysis done in 2012 to mature tea in several tea gardens of Southdown estate. These nutrients have been given little attention in Zimbabwe tea fertilizer recommendations despite their continual removal from the tea fields during harvesting. A study was therefore conducted to assess the effect of Copper, Magnesium and Zinc foliar fertilizers on yield and quality ...

Comparative efficacy of Trichoderma harzianum application methods for controlling Rhizoctonia solani in peas (Pisum sativum L.)

ABSTRACTThe use of Trichoderma has been widely used to control R. solani but however there is need to evaluate the different mechanisms used to administer the Biological Control Agent into the plant environment. A greenhouse experiment to compare the efficacy of three T. harzianum application methods i.e. seed bio-priming, seed coating and soil treatment to control R. solani in peas was carried at Kutsaga Research Station. The main objective of this study was to evaluate the efficacy of T. ha...

Effect of different multipurpose tree prunings and placement method on the growth and development of rape (Brassica napus L.)

ABSTRACTProduction of vegetables in the smallholder sector of sub-Saharan Africa (SSA) is affected bypoor soil fertility with nitrogen (N) being the most limiting nutrient. Continued nutrientmining without adequate replenishment has led to a corresponding decline in soil fertility andcrop yields due to failure by farmers in SSA to purchase inorganic fertilisers. Leguminousmultipurpose tree (MPT) prunings have widely been promoted as alternative sources of N butnutrient release is affected by ...

Effects Of Tobacco (Nicotiana Tabacum) Rotation And Fumigation On The Temporal And Spatial Distribution Of Roots-Knot Nematodes (Meloidogyne Ssp)

ABSTRACTRoot-knot nematodes cause significant yield losses in tobacco (Nicotiana tabacum). Their management is essential for the grower to maximize production. Nematodes migrate up and down the soil profile in response to host availability. The objective of the study was to evaluate the effect of tobacco rotations on the spatial and temporal distribution of nematodes. Sampling was done every month from September 2010 to April 2011. The experimental design was a split-plot in a randomized comp...