Linking Leaf Color Charts and Crop N-Status to Guide Fertiliser Application in Highland Rice Production Systems of Rwanda
Isaac Vincent1, Boshuwenda Andre Chuma1, Kalimuthu Senthilkumar2, Arisoa Rajaona2, Folkard Asch1
1University of Hohenheim, Inst. of Agric. Sci. in the Tropics (Hans-Ruthenberg-Institute), Germany
In farmers' fields or on experimental field stations sophisticated measurements for monitoring crop nutrient status are often not available. However, the nutrient status of the rice crop is an important indicator to guide fertiliser application strategies for nitrogen (N). Farmers aim to improve fertiliser applications with regards to crop, planting date, and region rather than following blanket N recommendations. The International Rice Research Institute has developed a Leaf Color Chart (LCC) as a diagnostic tool based on the greenness value of leaves to help farmers decide when to apply fertiliser. This method does not take into to account differences in leaf greenness that are due to variety, plant type, or leaf thickness. The aim of this work was to determine the influence of leaf thickness on the accuracy and transferability of LCC values with regards to actual, genotypic N status.
Keywords: Crop N-status, lCC, rice, SPAD
Contact Address: Folkard Asch, University of Hohenheim, Inst. of Agric. Sci. in the Tropics (Hans-Ruthenberg-Institute), Garbenstr. 13, 70599 Stuttgart, Germany, e-mail: fauni-hohenheim.de