Abstract
Currently, one of the most important objectives of agriculture is to maintain the principles of the sustainability. The use of precision technologies in agriculture belongs to this topic. The use of precision technologies is increasingly widespread in the cultivation of various agricultural crops, including maize. Sensing is an important part of these techniques. In our experiment we compared two methods: measuring relative chlorophyll content and the method of determine the extractable chlorophylls. The experimental plant was maize (Zea mays L.) and the measurements were performed at an early development stage (V8) of three genotypes. Three levels of nitrogen (0; 80; 160 kg ha-1) were applied during the experiment. The relative chlorophyll content was measured by SPAD-502 (Minolta, Japan) and a handheld GreenSeeker (Trimble, USA) device. The extractable total chlorophyll content decreased in parallel with the increased nitrogen level. The obtained SPAD values were diversified furthermore the NDVI values have not been changed for the effect of different nitrogen fertilization. In the early stages of development of maize, these parameters need to be complemented with other measurements to provide reliable information about the crops nitrogen status.
Highlights
Agriculture has to overcome with the global problems of our days like over population or global climate change
The SPAD-502 has visualized the relative chlorophyll content as SPAD (Soil Plant Analysis Development) value while the GreenSeeker shows the results as Normalized Difference Vegetation Index (NDVI)
The SPAD-502 device is appropriate for the examination of crop status at the silking stage in maize (Simkó et al, 2018)
Summary
Agriculture has to overcome with the global problems of our days like over population or global climate change. Precision technologies in agriculture can reduce the harm effects of weather factors The use of this technologies is increasing widespread in the cultivation of various agricultural crops, including maize production. Verhulst et al (2011) examined wheat and maize plants under different tillage and crop rotation systems with handheld NDVI sensor. They have observed a strong correlation between biomass accumulation and NDVI values. Grain yield under reduced nitrogen supply was correlated with an increased number of ears per plant, leaf chlorophyll concentration, leaf area index (Kamara et al, 2005). From the 1960s the yield of maize has increased significantly in the last 50 years (OWID, 2014)
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