Leaf nutrients content of tomato and incidence of insect pests and diseases following two foliar applications

ABSTRACT The leaf plays key roles in plant functions. In this study, we evaluated major nutrients (Nitrogen (N), phosphorous (P), and potassium (K)) contents of the leaves of tomato (Solanum lycopersicum) following applications of two foliar nutrients sources. Pest population dynamics as well as disease incidence and severity of the crop were also evaluated. The study was conducted at the Plantation Crops Section of the Kwame Nkrumah University of Science and Technology, Ghana in two consecutive cropping seasons. Two tomato varieties were treated with two foliar nutrients sources viz. Herbagreen and Sidalco liquid fertilizer in a split-plot layout. A conventional (granular) NPK fertilizer and a control (no application) were also evaluated. The foliar applications generally increased leaf N concentration of tomato more than the conventional NPK fertilizer and the control. Sidalco liquid fertilizer significantly (p < 0.05) increased foliar K concentration in the major season while Herbagreen increased K concentration by 108% over the NPK fertilizer in the minor season. However, leaf P concentrations were similar (p > 0.05) among the foliar and soil applications. The foliar applications (p < 0.05) reduced the densities of Bemisia tabaci (Gennadius) than the NPK fertilizer and the control in both seasons of cropping. In the minor season, Herbagreen (p < 0.05) reduced both incidence and severity of late blight. Herbagreen treated plants produced fruit yield comparable to the conventional NPK fertilizer and registered lower disease incidence and severity as well as lower insect pest populations possibly due to its silicon content.

[1]  D. Gozdowski,et al.  The effect of foliar fertilization with marine calcite in sugar beet , 2018 .

[2]  R. H. Bray,et al.  DETERMINATION OF TOTAL, ORGANIC, AND AVAILABLE FORMS OF PHOSPHORUS IN SOILS , 1945 .

[3]  P. Drechsel,et al.  Pesticide and Pathogen Contamination of Vegetables in Ghana’s Urban Markets , 2006, Archives of environmental contamination and toxicology.

[4]  J. Ma,et al.  Role of silicon in enhancing the resistance of plants to biotic and abiotic stresses , 2004 .

[5]  A. Page.  Methods of soil analysis. Part 2. Chemical and microbiological properties. , 1982 .

[6]  O. M. Andel.  Amino Acids and Plant Diseases , 1966 .

[7]  A. Horowitz.  Population dynamics of Bemisia tabaci (Gennadius): with special emphasis on cotton fields , 1986 .

[8]  M. Rady,et al.  Influence of soil and foliar applications of potassium fertilization on growth, yield and fiber quality traits in two Gossypium barbadense L. varieties , 2013 .

[9]  E. O. Mclean.  Soil pH and Lime Requirement , 1982 .

[10]  G. Devine,et al.  Evolutionary genetics. Insecticide resistance on the move. , 2002, Science.

[11]  J. Laary.  Dry-Season Farming and Agrochemical Misuse in Upper East Region of Ghana: Implication and Way Forward , 2012 .

[12]  A. Sabir,et al.  Effects of HerbaGreen application on vegetative developments of somegrapevine rootstocks during nursery propagation in glasshouse , 2010 .

[13]  M. Sarwar.  Effects of Zinc fertilizer application on the incidence of rice stem borers (Scirpophaga species) (Lepidoptera: Pyralidae) in rice (Oryza sativa L.) crop , 2011 .

[14]  R. Bélanger,et al.  Defense responses induced by soluble silicon in cucumber roots infected by Pythium spp. , 1994 .

[15]  Ian Denholm,et al.  Insecticide Resistance on the Move , 2002, Science.

[16]  N. Fageria,et al.  Foliar Fertilization of Crop Plants , 2009 .

[17]  Z. Jamal,et al.  Effects of Soil and Foliar Application of Different Concentrations of NPK and Foliar Application of (NH4)2 SO4 on Different Yield Parameters in Wheat , 2006 .

[18]  I. Baillie,et al.  Booker tropical soil manual. , 1986 .

[19]  N. Aery,et al.  Influence of Silicon on Growth, Relative Water Contents and Uptake of Silicon, Calcium and Potassium in Wheat Grown in Nutrient Solution , 2008 .