Turkish Journal of Field Crops

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THE EFFECT OF TILLAGE AND WHEAT RESIDUE MANAGEMENT ON NITROGEN UPTAKE EFFICIENCY AND NITROGEN HARVEST INDEX IN WHEAT

Elnaz EBRAHIMIAN, Alireza KOOCHEKI, Mehdi NASSIRI MAHALLATI, Surur KHORRAMDEL, Alireza BEHESHTI

Abstract

In order to evaluate the effects of tillage and wheat residue management on nitrogen uptake and distribution, nitrogen uptake efficiency, nitrogen use efficiency and nitrogen harvest index in wheat, a two-year field experiment was implemented as a split block experiment in a randomized complete block design with twenty treatments and three replicates at experimental site of Ferdowsi University of Mashhad, Iran in 2013 and 2014 growing seasons. Four different tillage practices namely, conventional tillage applied by mouldboard plough + disk, reduced tillage practices applied by sweep plough + disk and chisel plough + disk and conserved tillage applied by disk as vertical factor and five different crop residue applications (0, 25, 50, 75 and 100% wheat residue) as horizontal factor. According to the results, the lowest (2.58 %) and highest (2.77%) grain nitrogen percentage were observed when disk and chisel plough + disk were used, respectively. Employing chisel plough + disk led to the maximum nitrogen uptake efficiency and nitrogen use efficiency. Grain nitrogen percentage, nitrogen uptake efficiency and nitrogen use efficiency significantly increased with increasing wheat residue level. For instance, when wheat residue was applied at 75% ratio, nitrogen uptake efficiency increased by 61.2% compared with control treatment. According to the results it appears that application of wheat residue along with reduced tillage could improve nitrogen utilization efficiency, especially in arid and semi-arid regions.

Keyword: Nitrogen harvest index, Nitrogen uptake efficiency, Nitrogen use efficiency, Reduced tillage, Residue management, Wheat ,

Effects of Different Water Stress Levels on Biomass Yield and Agronomic Traits of Switchgrass (Panicum virgatum L.) Varieties under Semi-Arid Conditio

Erdal GONULAL, Suleyman SOYLU, Mehmet SAHIN

Abstract

A field experiment was conducted in the Wielkopolska region at the Gorzyń Research Station, Poland (52.34°N, 15.54°E) in Central Europe. The study was conducted over a 3-year period (2017, 2018, 2019) as a two-factorial design with four replications in the RCBD. The aim of the research was to determine the effect of the cultivar (‘Bolero’, ‘Tytan’) and the inoculation (Nitragina–seeds inoculation, Nitroflora I–seeds inoculation, Nitroflora II–soil inoculation, HiStick® Lupin–seeds inoculation) on plant development, seeds chemical composition and yielding of narrow-leaved lupin. The weather conditions and experimental factors significantly influenced on productivity of narrow-leaved lupin ‘Tytan’. Drought during the growing season reduced seeds and protein yields. After inoculation of HiStck the seeds yield was significantly greater by 12.4% (p < 0.01) and the protein yield after application of Nitroflora I or HiStick by 13.9% (p < 0.01) and 19.2% (p < 0.01), respectively. Correlation coefficients showed strong relations between number of pods and seeds per plant in both cultivars regardless of the inoculation variant, however the strongest relations in both cultivar were proved on HiStick treatment.
Keyword: Biological nitrogen fixation, chemical composition, legumes, protein efficiency, yielding