Handheld NDVI sensor-based rice productivity assessment under combinations of fertilizer soil amendment and irrigation water management in lower Moshi irrigation scheme, North Tanzania

Handheld optical sensor was used to measure canopy reflectance at red region (656 nm) and near-infrared region (774 nm) to generate NDVI data for monitoring rice productivity under soil amendment with combinations of fertilizers at two levels of water regime in smallholder Irrigation Scheme, in Lowe...

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Bibliographic Details
Published in:Environmental earth sciences 2023-02, Vol.82 (3), p.78, Article 78
Main Authors: Kimaro, Oforo Didas, Gebre, Sintayehu Legesse, Hieronimo, Proches, Kihupi, Nganga, Feger, Karl-Heinz, Kimaro, Didas N.
Format: Article
Language:English
Subjects:
Agricultural production
Biogeosciences
Canopies
Canopy
Correlation coefficient
Correlation coefficients
Crop growth
Crop yield
Crops
Design
Design of experiments
Earth and Environmental Science
Earth Sciences
Environmental Science and Engineering
Experimental design
Fertilizers
Flood irrigation
Floods
Geochemistry
Geology
Grain
Growing season
Growth stage
Height
Hydrology/Water Resources
Irrigation
Irrigation water
Irrigation water management
Land management
Moisture content
Nutrients
Optical measuring instruments
Plant cover
Position sensing
Productivity
Reflectance
Regression analysis
Regression models
Rice
Rice yield
Sensors
Soil
Soil amendment
Soil testing
Soil water
Soils
Statistical methods
Terrestrial Pollution
The Soil-Water-Atmosphere Nexus
Thematic Issue
Tillers
Urea
Water levels
Water management
Water regimes
Wetting
Yield forecasting
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Summary:Handheld optical sensor was used to measure canopy reflectance at red region (656 nm) and near-infrared region (774 nm) to generate NDVI data for monitoring rice productivity under soil amendment with combinations of fertilizers at two levels of water regime in smallholder Irrigation Scheme, in Lower Moshi, North Tanzania. The study was carried out in an experimental design which consisted of two irrigation water levels (flooding and system of rice intensification) with multi-nutrients (NPK) and single nutrient (urea) application replicated three times in a randomized complete block design. Flood irrigation water was applied at 7 cm height throughout the growing season, while SRI treatment irrigation water was applied at 4 cm height under alternate wetting and drying conditions. The annual rates of fertilizers applied was 120 kg N/ha, 20 kg P/ha, and 25 kg K/ha. The variety SARO-5 was used in this experiment. Simple correlation coefficient ( r ) was used to measure the degree of association between field crop performance parameters (plant height, number of tillers, biomass, yield) and NDVI across growth stages and three positions of the sensor above the canopy in the tested fertilizer combinations and water regimes. Results show that at any given fertiliser combinations and water levels, there was no significant correlation between plant height and NDVI except for the plant height at a vegetative stage for 0.6 m above the crop canopy and booting stage at 0.3 m and 0.6 m above the canopy, respectively ( P  
ISSN:1866-6280
1866-6299
DOI:10.1007/s12665-022-10730-0