Abstract
The present study examined the effects of different nitrogen (NH4NO3) and potassium (KNO3) fertilization levels in combination with a nitrogen-fixing, plant growth-promoting rhizobacteria (PGPR) inoculation on the carbohydrate (CHO), amino acid content, and nutrient concentrations (N, P, K) in the spears and the root system of asparagus plants. No significant differences were indicated between the different fertilization treatments regarding N, P, and K in the leaves and roots of asparagus. The inoculation of the asparagus fields with PGPR, no matter the type of the inorganic fertilizer, resulted in increased CHO and amino acid content of the foliage and roots of asparagus. The highest CHO content and amino acid content were recorded in the treatment that combined PGPR inoculation along with KNO3 fertilizer, indicating that higher K applications acted synergistically with the added PGPR.
Highlights
This study aimed to examine the effects of nitrogen-fixing plant growth-promoting rhizobacteria (PGPR) and different inorganic fertilizers that alter the applied N:K ratio on the sugar, amino acid content, and nutrient concentrations (N, P, K) in the root systems of asparagus, as well as on the nutritional values of asparagus spears
Our results revealed that the monosaccharide, disaccharide and total sugar leaf content differed significantly among samplings, as well as among treatments (Figure 2a–c)
Our results are complemented by Fernandez-Escobar et al [31], who stated that fluctuations in the nutrient content of the leaves during the plant growth cycle stated that fluctuations in the nutrient content of the leaves during the plant growth cyare attributed to the necessities of the depending on the phase
Summary
Asparagus yield maximization is always a vital element that can determine the long-term profitability of its cultivation. The yield determination of asparagus has been proven to be extremely complex since it is a perennial crop [2]. The productivity of asparagus is determined from a series of physiological processes that are strongly influenced by a wide range of environmental and management factors [3]. Indisputable factor determining the potential yield of asparagus plantations is the stored soluble carbohydrates (CHO) in the root system [4], which is characterized by a gain and loss pattern during the crop’s annual cycle [2]. Sufficient availability of CHO is detrimental for spear growth during the harvesting period and the development of a vigorous fern canopy after the harvest [2]
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