BORON-NITROGEN RELATIONSHIP IN WHEAT (Triticum aestivum L.) GROWN WITH THE NUTRIENT SOLUTION

The effects of boron applied 0.01, 0.1, 1.0, and 10.0 µg B/ml levels as boric acid (H3 BO3), and nitrogen applied 25, 100, 200, and 400 µg N/ml as ammonium nitrate (NH4 NO3), respectively, on the amount of dry matter yield, and boron, nitrogen and nitrate contents of wheat (Triticum aestivum L.) grown in perlite medium with Ruakura nutrient solution under greenhouse conditions were investigated. Dry matter yield and nitrate contents of wheat were decreased and boron content was increased with increasing boron application. Controversially, application of nitrogen increased dry matter yield, nitrogen and nitrate contents of wheat, while decreases in boron contents. Those effects of boron and nitrogen were found to be statistically significant (P<0.01). It was determined that addition of high levels of nitrogen alleviated boron toxicity. Low-level boron application caused in nitrate accumulation in plants.

BESÝN ÇÖZELTÝSÝNDE YETÝÞTÝRÝLEN BUÐDAY (Triticum aestivum L.) BÝTKÝSÝNDE BOR-AZOT ÝLÝÞKÝSÝ

Sera koþullarýnda perlitte Ruakura besin çözeltisiyle yetiþtirilen buðday (Triticum aestivum L.) bitkisine, artan düzeylerde uygulanan bor ile azotun, bitkinin geliþmesi ile bor, azot ve nitrat kapsamlarý üzerine etkileri araþtýrýlmýþtýr. Ruakura besin çözeltisine bor, borik asitten (H3 BO3) sýrasýyla 0.01, 0.1, 1.0 ve 10.0 µg B/ml, azot ise amonyum nitrattan (NH4 NO3) sýrasýyla 25, 100, 200 ve 400 µg N/ml düzeylerinde uygulanmýþtýr. Artan miktarlarda uygulanan bor, buðday bitkisinin kuru madde miktarýný ve nitrat kapsamýný azaltýrken, bor kapsamýný artýrmýþtýr. Azot uygulamasý ise deneme bitkisinin kuru madde miktarýný, azot ve nitrat kapsamlarýný artýrýrken, bor kapsamýný azaltmýþtýr. Bor ve azotun bu etkileri istatistiki yönden önemli olmuþtur (P<0.01). Yüksek dozlarda azot uygulamasý bitkide bor toksisitesini hafifletmiþtir. Düþük bor düzeylerinde ise bitkide nitrat biriktiði belirlenmiþtir.