NDVI in oilseed rape
Satellite images and calculations based on vegetation indexes enable accessing the condition of crops. Thanks to Fertisat it is possible to explore and analyze both historical and actual data.
Creating plant indicators is based on the analysis of the properties of objects
which are reflected in a given range. The plants that happen to be in a good condition reflect a lot of near-infrared radiation and little red radiation.
Different types of ground cover or soil have completely different properties and therefore reflect radiation to a completely different extent than healthy plants. One of the most popular indicators used in precision agriculture is the NDVI (Normalized Difference Vegetation Index). The values of this plant index range from -1 to +1, where values below zero characterize water and built-up areas and NDVI values above 0.2 to 1 are characteristic for plant vegetation in various conditions. It is assumed that the value of the index above 0.6 is very good for crop growth development. Using the NDVI indicator, we can check the current condition of crops, as well as its diversity within the field and the way it changes over time.
The most intensive growth among winter plants in autumn is observed in the case of winter oilseed rape which is already shaping its yield at this time. The number of leaves produced before winter determines the number of side shoots. The most important is the density per area unit which in the case of winter oilseed rape determines the yield in 70%. Therefore, it is very important to monitor the plants properly which allows to make appropriate agronomic decisions to keep plants in a very good condition until the end of the growing season. The variable density that can be observed in the analyzed example both during the visit to the field and by the differentiation of the NDVI index on the map results in the variability of meteorological and soil conditions. While knowing the situation in our fields we are able to perform appropriate intervention treatments that will allow us to achieve high yields in the summer next year.
Satellite monitoring is a simple and useful tool for everyday use by farmers. On the one hand, Fertisat platform allows the user to easily observe the condition of plants and on the other hand, it facilitates the creation of variable nitrogen fertilization maps and also enables the calculation of the amount of nitrogen fertilization in accordance with the Nitrates Directive. One tool – many benefits.
Published: Oct. 16, 2020