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The Leaf Greenness Index SPAD and Selected Features of Potato Following an Application of Herbicides and Biostimulants
Krystyna Zarzecka 1  
,   Marek Gugała 1  
,   Iwona Mystkowska 2  
,   Anna Sikorska 3  
 
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1
Siedlce University of Natural Sciences and Humanities, Faculty of Agrobioengineering and Animal Husbandry, B. Prusa 14 st., 08-110 Siedlce, Poland
2
Pope John Paul II State School of Higher Education in Biała Podlaska, Faculty of Health Sciences, ul. Sidorska 95/97, 21-500 Biala Podlaska, Poland
3
The State Higher School of Vocational Education in Ciechanów, Faculty of Engineering Sciences, ul. Narutowicza 9, 06-400 Ciechanów, Poland
CORRESPONDING AUTHOR
Krystyna Zarzecka   

Siedlce University of Natural Sciences and Humanities, Faculty of Agrobioengineering and Animal Husbandry, ul. B. Prusa 14, 08-110 Siedlce, Poland
 
 
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ABSTRACT
The objective of the research was to determine the effect of herbicides and herbicides combined with biostimulants on the leaf greenness index SPAD and selected potato characteristics, i.e. plant height, yield of large tubers and the vitamin C content. A three-year experiment was conducted to examine the following factors: factor I – three potato cultivars: Bartek, Gawin, Honorata; factor II – five methods of an application of herbicides and biostimulants: 1. control unit without chemical control, 2. the Harrier 295 ZC herbicide (linuron + clomazone), 3. the Harrier 295 ZC herbicide (linuron + clomazone) and the Kelpak SL biostimulant (Ecklonia maxima), 4. the Sencor 70 WG herbicide (metribuzin), 5. the Sencor 70 WG herbicide (metribuzin) and the Asahi SL biostimulant (sodium para-nitrophenol, sodium ortho-nitrophenol, sodium 5-nitroguaiacol). The cultivars investigated in the experiment significantly affected the leaf greenness index SPAD, plant height, yield of large tubers and the vitamin C content. The herbicides and biostimulants enhanced the values of the examined potato characteristics. Linear correlation coefficients confirm a strong, significant, positive correlation between the SPAD index and plant height, yield of large tubers and vitamin C content.