Abstract
In 2018-2019, the effect of different levels of soil phosphorus on the pigment complex of the clover (Trifolium pratense L.) leaves was assessed. Total chlorophyll content was 15.34-19.05 and 11.47-14.10 mg g- 1 dry matter, of which Chl a accounted for 9.64-11.36 and 6.67-7.98 mg g-1 (2018 and 2019 respectively). Carotenoids content varied within 2.69-3.12 and 1.52-1.88 mg g-1 in 2018 and 2019 respectively. Weight ratio of total chlorophyll/carotinoids (5.7-6.7 in 2018 and 6.8-9.6 in 2019) gives the grounds to consider that there was not disorders in structure of the pigment complexes of leaves in both year. There were statistically significant linkage of level of soil phosphorus with Chl a (r = 0.536-0.743) and Chl b (r = 0.725-0.748) in cooler conditions of 2019. In wormer 2018, these links were insignificant (Chl a = -0.146 to -0.286 and Chl b = -0.257 to -0.275). Correlation between phosphorus content in soil and carotenoids content in leaves was insignificant in all cases. Chl pigments showed a polynomial second order relationship with level of soil phosphorus. In 2019, these relations was statistically significant at p ≤ 0.05 (R2 = 0.68-0.76) for both chlorophylls. Under conditions of 2018 these relations was insignificant (R2 = 0.10-0.43).
Highlights
Growing concern about the negative side effects of modern agriculture has stimulated the need to find new agronomic solutions to improve the ecological profile of agricultural systems [1, 2]
The content of pigments in the leaves of the meadow clover was most dependent on the conditions of the growing year
Based on the weight ratio of chlorophylls a/b (1.541.75 in 2018 and 1.18-1.47 in 2019) and mass ratio of the sum of chlorophylls to carotenoids (5.7-6.7 in 2018 and 6.8-9.6 in 2019) one could proposed that even unfavorable weather did not lead to disorders of the structure of the photosynthetic apparatus of the leaves of the meadow clover
Summary
Growing concern about the negative side effects of modern agriculture has stimulated the need to find new agronomic solutions to improve the ecological profile of agricultural systems [1, 2]. The role of cover crops, which can increase yields, as well as reduce environmental impact in agricultural systems, is increased [1, 3] They are able to modify significantly soil conditions: reduce the degree of compaction and erosion [1], increase porosity [4], improve the ability to retain and remobilize nutrients [5], enrich the soil with organic substance, especially in the case of legume species [6], and increase the availability of phosphorus to plants [7]. Meadow clover is designated which leaves significantly exceed in the content of chlorophyll such legumes as lupine, soybean, beans [9]
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