Effect of plant based organic fertilizers and chicken manure extract on plant growth and root zone activities of tomato

B. Pokhrel, J.N. Sorensen, K.K. Petersen
The aim of the present study was to investigate the effects of fertigation with chicken manure extract, lupin sap or a combination of the two on nutrient concentration, pH and electrical conductivity (EC) in the growing medium and on growth parameters of tomato (Solanum lycopersicum L.). Six fertigation treatments were established in a completely randomized design under greenhouse conditions. Two were control treatments, one without liquid fertilizer (W) and the other one based on inorganic fertilizers (IN). Two organic treatments received only either lupin sap (L) or chicken manure extract (C) the third was a 1:1 (v/v) mixture of C and L (CL) and the fourth treatment received L + inorganic micronutrients (LM). The shoot fresh and dry weight, and total leaf area were higher in the IN treatment than in the organic treatments and among organic treatments C had higher values than L. The pH of the growing medium solution was around one unit higher in C compared with IN and another half to one unit higher in L compared with C. The high EC measured in L was primarily due to a high concentration of potassium. Other nutrients such as phosphorus, nitrogen and most of the micronutrients were present in deficit levels in L. In the growing medium of the C treatment the concentrations of nitrogen, calcium and magnesium were lower and the concentrations of potassium, chloride, sodium and iron were higher than in IN. When the two organic fertilisers were compared, C resulted in higher phosphorus, sulphur, sodium and micronutrient concentrations but lower potassium and magnesium concentrations in the growing medium than L. This study indicates that chicken manure extract has the potential to support a higher biomass production if the soil pH is controlled at an optimum level and the concentration of available nitrogen is increased.
Pokhrel, B., Sorensen, J.N. and Petersen, K.K. 2017. Effect of plant based organic fertilizers and chicken manure extract on plant growth and root zone activities of tomato. Acta Hort. (ISHS) 1164:173-180
biomass yield, fertigation, nutrient concentration, organic fertilizer, Solanum lycopersicum L

Acta Horticulturae