Assessment of nutrient diagnostic techniques for fertilizer recommendation for irrigated lowland rice
2013
Bascon, M.V.R. | Cruz, R.T.
Current nutrient diagnostic techniques (NDTs) were assessed based on grain yield and nutrient-use efficiency to guide farmers and technicians on which NDT to use. The NDTs were: 1) PakayCheck System of integrated crop management that uses Leaf Color Chart (PCheck-LCC) for real-time N application, 2) Soil Test Kit (STK) that uses prepared solution for dry soil sample to determine soil pH and NPK levels by colorimetric method and table for fertilizer recommendation and 3) Nutrient Manager (NM), a software program providing fertilizer recommendation based on standard soil and crop input data. Field experiment was conducted in 2012 dry season using these NDTs in comparison with the Farmers' Fertilizer Practice (FFP), which is based on farmers' field experience. PSB Rc82 was used as test variety. PCheck-LCC had the highest grain yield of 9.7 t/ha, STK had 9.4 t/ha, FFP had 8.7 t/ha and NM with the lowest grain yield of 7.9 t/ha. Agronomic nitrogen-use efficiency was highest in NM with 37.8 kg grain/kg N applied. STK had 28.2 kg grain/kg N applied, FFP had 25.9 kg grain/kg N applied and PCheck-LCC with 25.4 kg grain/kg N applied.
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