Hakan Geren

EFFECTS OF DIFFERENT NITROGEN LEVELS ON THE GRAIN YIELD AND SOME YIELD COMPONENTS OF QUINOA (Chenopodium quinoa Willd.) UNDER MEDITERRANEAN CLIMATIC CONDITIONS

ABSTRACT Quinoa ( Chenopodium quinoa Willd.), is a pseudo-cereal crop that has been cultivated in the Andean region in South America. The quinoa as a field crop has a great potential in the improvement of food for humans and animals even under the conditions of marginal lands. For getting high crop yields, nutrients in balanced amount are a basic requirement. Experiments were carried out at the Bornova experimental fields of Field Crops Dept. of Agriculture Fac., Ege Univ., Turkey during 2013 and 2014 main crop growing season in order to evaluate the effect of seven nitrogen levels (0, 50, 75, 100, 125, 150 and 175 kg ha -1 ) on the grain yield and some yield components of cultivar Q-52 of quinoa. Results indicated that the effects of nitrogen treatments and years on all characteristics tested were significant. Nitrogen level of 150 kg ha -1 was proved to be the best level for nitrogen supplementation of soil for grain yield (2.95 t ha -1 ) and crude protein content ( 16% ) of quinoa under Mediterranean ecological conditions of Bornova. Key words: quinoa, Chenopodium quinoa , nitrogen level, grain yield.

EFFECT OF DIFFERENT PLANT DENSITIES ON THE YIELD AND SOME SILAGE QUALITY CHARACTERISTICS OF GIANT KING GRASS (Pennisetum hybridum) UNDER MEDITERRANEAN CLIMATIC CONDITIONS

ABSTRACT The aims of this study were to determine the adaptability of giant king grass ( Pennisetum hybridum ) under Mediterranean climate conditions, and also to determine whether proper plant densities could improve growth and yield. Study site was located at Bornova, Turkey (38°27.236 N, 27°13.576 E and 20 m). Treatment consisted of four densities of plant population (D 1 :57,143; D 2 :28,571; D 3 :19,048 and D 4 :14,286 plant ha -1 ) with three replicates per treatment in a randomized block design. Setts were planted in mid June of 2010 and allowed to grow for 4 full growing seasons. Average result of four years indicated that there were significant effects of plant densities on the dry matter yield and other yield characteristics of giant king grass but not on silage pH. It was recommended that the production of giant king grass using D 2 (70x50 cm) was the most successful planting density regarding the dry matter (32.6 t ha -1 ) and crude protein yield to the regions with Mediterranean-type climates under irrigation . Key words: G iant king grass, plant density, dry matter yield, silage quality.

Effects of previous legume crop levels of nitrogen and sowing date on yield components and some morphological characteristics of corn

This study was conducted in order to determine the effect of different previous crops and sowing dates on the grain yield and some other yield components of corn under typical Mediterranean climatic conditions during summer period of 2013 and 2014. The experiment was laid out in a split-plot design in the form of randomized complete blocks with three replications. The main plots were allocated to three sowing dates (Early Spring, Mid Spring and Late Spring) and sub-plots to previous crops (Vicia sativa, Vicia villosa, Lathyrus sativus, Trifolium resupinatum and Pisum arvense) and three different controls without previous crop (control-1: 100 kg ha-1 N; control-2: 200 kg ha-1 N and control-3: 0 kg ha-1 N). Corn grain yield, yield components (number of ears per plant, number of seeds per ear, ear length, ear diameter, 1000-grain weight) and plant height were assessed. The results showed that late planting date had a significantly negative effect on tested traits and second planting date (mid- spring) produced higher corn grain yield compared to the other dates. The highest corn grain yield (11011 kg ha-1) also occurred in control-2 (200 kg ha-1 N without previous crop) treatment and was significantly different from the other previous crop treatments with 100 kg ha-1 N and controls except Vicia villosa as previous legume crop of which corn grain yield was comparable with it.

Farklı Sıra Arası Uzaklıklarının Kimi Arıotu (Phacelia tanacetifolia Bentham) Çeşitlerinde Ot Verimi ile Verim ve Kalite Özelliklerine Etkileri

Arastirma, Bornova-Izmir ekolojik sartlarinda, 2 yil sureyle , farkli sira arasi uzakliklarinin (17.5-35.0-52.5 cm) degisik ariotu cesitlerinin (Menemen-Barcelia) ot verimi ve diger bazi kalite ozelliklerine etkisini belirlemek amaciyla yurutulmustur. Sonuclara gore; sira arasi mesafesi bitki boyu, yesil ve kuru ot verimi ile kuru madde verimi, vb karakterleri onemli derecede etkilemistir. En yuksek degerler, 17.5 cm sira arasi mesafesine ekilen bitkilerden elde edilmistir. Incelenen ariotu cesitleri arasinda da onemli farkliliklar saptanmistir. Ot verimi bakimindan Barcelia cesidinin Menemen cesidinden daha ustun sonuc verdigi belirlenmistir