Relationship between leaf area, above-ground mass and morphometric indices in miscanthus

Abstract

To establish varietal characteristics of yield formation in grain sorghum as affected by row spacing and fertilization system. Methods. The field experiment was carried out during the 2015-2017 period in a multifactorial stationary experiment in LLC Biotech LTD located in the central part of Boryspil district (Kyiv region) of the Left-Bank Forest-Steppe of Ukraine. Experiment design: factor Ahybrid: 'Lan 59', 'Burgo F1', 'Briggo F1'; factor Bdose of nitrogen fertilizers: N60P60K60 (control), N60P60K60 + N20, N60P60K60 + N40, N60P60K60 + N60; factor Crow spacing: 35 cm, 50 cm, 70 cm. Results. The average yield of grain sorghum for years of research ranged from 3.98 to 9.14 t/ha, depending on hybrid, row spacing and fertilization practice. It was also found that average grain yield in 2015 amounted to 7.29 t/ha; 2016 was critical with regard to weather conditionsthe realization of the biological potential of sorghum plants was significantly lowerat the level 6.33 t/ha; in 2017, the average yield was 7.15 t/ha of grain. Among the hybrids, the least productive was 'Lan 59' (5.14 t/ha), and an average yield of 'Burgo F1' and 'Briggo F1' were 7.57 and 8.06 t/ha, respectively. The maximum yield for all hybrids was formed at the 50-cm row spacing, namely 'Lan 59'-5.40," 'Briggo F1'-8.48 t/ha and 'Burgo F1'-7.86 t/ha, respectively. With the pre-sowing application of N60 compared to N20, the yield of hybrid 'Lan 59' grew by 0.41-0.51 t/ha, 'Briggo F1' by 0.27-0.40, 'Burgo F1' by 0.22-0.29 t/ha. Conclusions. The biggest share in sorghum yield formation had the 'hybrid' factor (43%). 'Conditions of year' factor (21%) and 'dose of nitrogen' (20%) had an equivalent effect, and 'interrow spacing' factor amounted to 10%. Studies have shown that there is a positive moderate correlation between yield and dose of pre-sowing nitrogen (r = 0.49). Grain sorghum plants react positively to additional nitrogen, what is manifested in increased yields. This dependence can be explained not only by moderate nitrogen application rates but also by the low level of hydrolyzed nitrogen stock in the soil of the experimental plot.

Dynamic of Morphological and Physiological Parameters and Variation of Soil Characteristics during Miscanthus × giganteus Cultivation in the Diesel-Contaminated Land

“…The soil contamination's negative impact was neglected when biochar was incorporated into the system; the plant height in September for cases B and C was similar to A in the presence of B1 and B2. The morphological characteristics of M. × giganteus when the plant was cultivated in the traditional agricultural land showed a close correlation between height and weight of the shoots, numbers of leaves in each shoot and surface of the leaves [69]. Current research confirmed this correlation (Figure 3, Figure 4 and Figure S1) when an essential impact of the soil contamination on the morphological parameters was detected.…”

“…The number of M. × giganteus leaves was connected with their surface having a correlation coefficient equal to 7.76 ± 0.07 [69]. The M. × giganteus leaves' surface was calculated using the approach described at Kvak et al [70] and presented in Figure 4.…”