Suitability of NDVI index to pea condition evaluation at diverse phosphorus fertilization

Abstract

In this 3-year study the suitability of the normalized differenced vegetation index (NDVI) to the evaluation of pea plant infestation by aphids and expected seeds yield was investigated. The effect was assessed in the conditions of the increasing doses of phosphorus fertilization (0, 70, and 140 kg P2O5 ha–1) and in the different pea aphid (Acyrthosiphon pisum Harris) occurrence on six various cultivars of pea. Independent of the dose, the phosphorus fertilization supported the occurrence of aphids on pea plants of Batuta, Model, and Protecta cultivars where in Tarchalska and Mecenas cultivars only the standard dose (70 kg ha–1) showed such effect. NDVI index was not clearly, unambiguously correlated to the intensity of A. pisum occurrence. Such factors as the deficiency or excessive amount of phosphorus, as well as meteorological conditions and the cultivar of host plant had the greater effect on its value than the presence of aphids. All this testifies that the NDVI index is not reliable indicator of aphid occurrence on pea, however it can offer a promising method to select the cultivars under sub-opitmal conditions. The seed yield was strongly related to agronomical factors (fertilization, cultivars) and plant (NDVI) variable, while marginally to environmental variable (aphids).

Effectiveness of a Complex Fertilisation Technology Applied to Zea mays, Assessed Based on Normalised Difference Vegetation Index (NDVI) from Terra Moderate Resolution Imaging Spectroradiometer (MODIS)

“…Easily available forms of phosphorus contained in the applied foliar fertiliser produced a positive effect on the nutritional status of maize in the experimental variants F1 and F3, which was confirmed by the values of NDVI. A relationship between phosphorus and leaf greenness reflected by NDVI was also reported by Gospodarek et al [33]. The authors explicitly demonstrated that NDVI value for A. pisum plants is correlated to amount of phosphorus fertiliser applied.…”

Productivity of Three Pea (Pisum sativum L.) Varieties as Influenced by Nutrient Supply and Meteorological Conditions in Boreal Environmental Zone

“…There are different opinions about the fertilization of peas. Some researchers say that pea fertilizer rates depend on nutrients in the soil [ 20 ]. Huang et al [ 17 ] found that when before sowing in soil and NO 3 -N was low (10 kg·ha −1 ), an application of starter N positively influenced pea yield (up to +19%); however, under higher initial soil NO 3 -N (44 kg·ha −1 ), the application of starter N reduced pea yield.…”

“…However, other studies have shown that in soil with a high nitrate–nitrogen content, starter N application had a detrimental effect on pea germination, and nodulation and seed yield [ 17 ]. The efficiency of fertilizers is governed by meteorological conditions and the nutrient content in the soil [ 18 , 19 ]; therefore, recommended NPK rates can vary widely [ 20 , 21 ]. The phosphorus and potassium requirements of peas vary depending on the growing conditions [ 20 ].…”

“…The efficiency of fertilizers is governed by meteorological conditions and the nutrient content in the soil [ 18 , 19 ]; therefore, recommended NPK rates can vary widely [ 20 , 21 ]. The phosphorus and potassium requirements of peas vary depending on the growing conditions [ 20 ]. Potassium stimulates the transport of nitrogen from root nodules to the aboveground parts and affects protein synthesis [ 22 ].…”

Green Cover (Tree) Analysis of Chennai Metropolitan Area Using High Resolution Satellite Imagery

“…Index (NDVI) is one of the most widely used and reliable vegetation indices in monitoring vegetation change, emerging as a promising method to evaluate the green cover [39]. Google earth imagery is useful for the reliable validation of NDVI and semi-supervised image classification, which can save time and reduce cost [40].…”