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Net Primary Productivity (NPP) is the rate at which biomass accumulate per unit area per time, minus amount of organic materials used for autotrophic respiration. This study aimed at determines the influence of edaphic fertility on herbaceous NPP. Soil samples were collected using soil auger at 0-15cm depth, and chemical parameters were analysed using standard methods. NPP was determined in 400 (1m x 1m) randomly selected quadrats, by clipping aboveground biomass of central 20cmx20cm quadrats and digging 40cm depth for collecting belowground biomass using hands and forceps.
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