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    Nitrogen rate and timing implementation on durum wheat in a bed planting system
    (Penerbit Universiti Kebangsaan Malaysia, 2016) Yildirim M.; Yakut Z.; Akinci C.; Kurt F.; Kizilgeci F.
    The effects of nitrogen (N) fertilization at different growth stages were investigated on durum wheat (Triticum durum L.) grain yield and yield components (with irrigated bed planting) in Diyarbakir, Turkey. N was applied at a rate of 140 kg ha-1 and distributed to one, two and three applications at various combinations with five different growth stages (i.e. sowing, seedling growth, early tillering, stem elongation and booting). This study included 13 treatments, including the control (zero nitrogen). The N application timings (NAT) of the 50% sowing + 50% early tillering and 66% sowing + 33% early tillering treatments were most suitable for durum wheat. The results showed that NAT had significant effect on flowering time, S PA D readings of the early milky ripe stage, plant density, thousand kernel weights, grain filling duration, grain filling rate, grain N content, grain yield, harvest index and grain N yield. In summary, the highest values of parameters studied were obtained from the 50% sowing + 50% first tillering and 66% sowing + 33% early tillering treatments. N fertilization application rate and time of durum wheat genotypes should consist of applying 50-60% of the total N fertilizer at sowing and 40-50% at the early tillering stage under irrigated conditions and with bed planting.
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    The response of cotton (gossypium hirsutum L.) to soil applied elemental sulphur under boron toxicity
    (Parlar Scientific Publications, 2016) Kurt F.; GultekinTemiz M.
    This study was conducted between 2013 and 2014 to determine the effect of sulphur fertilization on boron toxicity in cotton. Two sulphur doses (0-1 tha-1) as main plots and four boron doses (0, 2.5 ppm, 5 ppm and15 ppm) as subplots were arranged in randomized complete split block design. According to the results, despite lack of phytotoxic symptoms of B, 5 mg B kg-1, B treatment showed significant effects on seed cotton yield, gin turnout, fiber maturity, and fiber elongation. However, the influence of B was uneven and inconsistent between years and among B dosages. Therefore, it could be concluded that higher doses of B applications should be avoided for higher lint yield and fiber qualities. In terms of S application, the amount of S dose employed in this study significantly decreased seed cotton yield and gin turnout; however, it had no effect on other lint quality parameters. This result may be of particular importance to the cotton growing soils with higher pH, which is required in applying higher doses of sulphur for optimum yields.