Yield Performance of Spring Oats Varieties as a Response to Fertilization and Sowing Distance

Abstract

The main objective of this paper is to evaluate the yield potential of 25 different varieties of oat as a reaction to seeding distance and fertilization for improvement of crop technology and identification of the most adapted varieties. Based ANOVA test, the main influence on yield is due to climate, followed by the amount of fertilizers. The sowing distance reveals its influence when combined with the fertilization, this aspect pointing out the differences between studied varieties. The triple interactions gradually reduce the influence of the factors, their combination being very significant in the case year X sowing distance X variety. The spatial comparative analysis of the three experimental years presents an overlap in the median area of the PCA ordering of the 12.5 cm sowing distance, fertilized with N50P50 with the 25 cm sowing distance fertilized with N100P50. There are differences between the oat varieties regarding the reaction to the nitrogen fertilization, highlighting especially the Mureşana variety where comparable yields are obtained on both levels of fertilization: 5.18 t ha−1 (N50P50) and 5.59 t ha−1 (N100P50).

The Effect of Cultivation Practices on Agronomic Performance, Elemental Composition and Isotopic Signature of Spring Oat (Avena sativa L.)

“…The results of the mixed model ANOVA test and the performance of the model for δ 15 N and δ 13 C values in oat grains are shown in Table 4. Here, significant differences were found between treatments for δ 15 N (p = 0.040 and p = 0.039, respectively) and δ 13 C values (p = 0.031 and p = 0.006, respectively) for both Trial 1 and Trial 2. However, the cultivation year did affect the δ 13 C values in both trials (p = 0.004, and p < 0.001, respectively).…”

“…Here, significant differences were found between treatments for δ 15 N (p = 0.040 and p = 0.039, respectively) and δ 13 C values (p = 0.031 and p = 0.006, respectively) for both Trial 1 and Trial 2. However, the cultivation year did affect the δ 13 C values in both trials (p = 0.004, and p < 0.001, respectively). Figure 4 shows the response of δ 15 N and δ 13 C values in oat grains to N rate and agronomic management practices of the long-term experiment in 2016 and 2017.…”

“…However, generally, an increase in yield is observed with the addition of synthetic N, but only within a certain range, usually up to 100 kg N/ha. Exceeding this range increases lodging, resulting in yield and quality losses [12][13][14].…”

“…The discriminatory power of δ 15 N has been described in several studies, and the values are influenced by the botanical plant species and the bacterial activity associated with its growth [17], the geographical origin [18] and the agricultural practices used [15,19]. Although there is limited information for δ 15 N values in oat grains, δ 13 C values have been successfully used to identify salttolerant genotypes of forage oats [20]. However, the use of δ 13 C as a marker for organic and conventional production has shown variation between studies, suggesting that δ 13 C values are generally independent of fertilizer source or do not vary sufficiently to distinguish the production system [21][22][23].…”

“…Although there is limited information for δ 15 N values in oat grains, δ 13 C values have been successfully used to identify salttolerant genotypes of forage oats [20]. However, the use of δ 13 C as a marker for organic and conventional production has shown variation between studies, suggesting that δ 13 C values are generally independent of fertilizer source or do not vary sufficiently to distinguish the production system [21][22][23].…”