Determination of Suitable Extraction Method for the Available Iron (Fe) Content of Calcareous Soils

The aim of this research was to determine the most suitable extraction method for the available iron contents of calcareous soils in Trakya Region, Turkey. For this purpose ten calcareous soil samples were taken from research area and five extraction methods (Lindsay and Norvell, Wear and Evans, Olson, Soltanpur and Mehlich methods) were used and three biological indices (dry matter yield, Fe concentration, Fe uptake) were compared. The plant biological indices were determined with wheat (Triticum aestivum L.) plant grown under greenhouse conditions. At the end of the experiment, the highest correlation coefficients (r) were determined between the 0.005 M DTPA + 0.01 M CaCl2 + 0.1 M TEA, 0.005 M DTPA + 1 M NH4HCO3 methods and the biological indices. The correlation coefficients (r) for the 0.005 M DTPA + 0.01 M CaCl2 + 0.1 M TEA method and the three biological indices were 0.648**, 0.780** and 0.656** respectively. For the 0.005 M DTPA + 1 M NH4HCO3 method, these coefficients were determined 0.595**, 0.637** and 0.625**, respectively. Consequently, these extraction methods were suggested for the determination of the available Fe contents of the calcareous soils in Trakya Region, Turkey

The effects of the increased doses of leonardite applications on the content of some macro and micro nutrient elements of pak choi (Brassica rapa L. subsp. var. Chinensis L.) plant

The present research has been contented to determine the effects of the increased leonardite application on the some macro and micro nutrient elements of pak choi (Brassica rapa L. subsp. var. Chinensis L.) plant. The research was designed as 3 replications according to the randomized block experimental design. Leonardite was applied to the parcels with 4 doses and as the 1st dose: 0 ppm m-2, the 2nd dose: 60 ppm m-2, the 3rd dose: 120 ppm m-2and the 4th dose: 150 ppm m-2. According to research results, the total N content of the plant samples were determined of 5.43 %, 5.58 %, 5.69 %, and 5.73 % for four leonardite doses respectively. The contents were determined as P (0.40 %, 0.42 %, 0.41 %, 0.41 %); K (5.49 %, 5.73 %, 5.83 %, 6.01 %); Ca (1.85 %, 1.91 %, 2.06 %, 2.29 %); Mg (0.12 %, 0.13 %, 0.13 %, 0.14 %); and S (3.39 %, 4.65 %, 4.83 %, 4.84 %) and some micro elements contents were obtained as Fe (96, 110, 112, 120 mgkg-1); Cu (5, 8, 18, 24 mgkg-1); Mn (12, 16, 22, 94 mgkg-1); and Zn (32, 34, 36, 37 mgkg-1) for four doses, respectively. According to the results, the effects of the increasing doses of the leonardite application on some macro and micro nutrient elements contents of pak choi plant were determined statistically significant. These increases were found to be significant at the level of 5 % statistical degree, except P and Mg nutrient elements

Determination of Suitable Extraction Method for the Available Iron (Fe) Content of Calcareous Soils

The aim of this research was to determine the most suitable extraction method for the available iron contents of calcareous soils in Trakya Region, Turkey. For this purpose ten calcareous soil samples were taken from research area and five extraction methods (Lindsay and Norvell, Wear and Evans, Olson, Soltanpur and Mehlich methods) were used and three biological indices (dry matter yield, Fe concentration, Fe uptake) were compared. The plant biological indices were determined with wheat (Triticum aestivum L.) plant grown under greenhouse conditions. At the end of the experiment, the highest correlation coefficients (r) were determined between the 0.005 M DTPA + 0.01 M CaCl2 + 0.1 M TEA, 0.005 M DTPA + 1 M NH4HCO3 methods and the biological indices. The correlation coefficients (r) for the 0.005 M DTPA + 0.01 M CaCl2 + 0.1 M TEA method and the three biological indices were 0.648**, 0.780** and 0.656** respectively. For the 0.005 M DTPA + 1 M NH4HCO3 method, these coefficients were determined 0.595**, 0.637** and 0.625**, respectively. Consequently, these extraction methods were suggested for the determination of the available Fe contents of the calcareous soils in Trakya Region, Turkey

Domateste Azot Dozu ve Sulama Aralıkları ile Verim, Kalite ve Yaprak Besin Elementi İçeriği Arasındaki İlişkiler

Özet Domates (Lycopersicum esculantum L.) yetiştiriciliğinde&nbsp; azot dozları ve sulama aralıkları fertigasyonda önemli rol oynamaktadır. Bu çalışmada, farklı azot dozları (N1= 119 kg ha-1, N2= 169 kg ha-1 ve N3= 241 kg ha-1) ve sulama aralıklarının (S1=her gün sulama, S2=&nbsp; üç günde bir sulama ve S3= beş günde bir sulama) domateste fertigasyon uygulamasında verim ve kalite özellikleri üzerine etkileri araştırılmıştır. Çalışma 2009 ve 2010 yıllarında tesadüf bloklarında bölünmüş parseller deneme desenine göre 3 tekerrürlü yürütülmüştür. Bitki su ihtiyacı FAO 56 Penman-Monteith yöntemi kullanılarak hesaplanmış ve toprak nemi takip edilerek sulama uygulamaları kontrol edilmiştir. En yüksek verim 2009 ve 2010 yıllarında N3 x S2 uygulamasından elde edilmiştir. Artan azot dozları verimde linear artış sağlamıştır. Meyvede vitamin C ve pH içeriği azot dozları ve sulama aralığından etkilenmemiştir. Yüksek azot dozlarında suda çözünebilir kuru madde miktarı ve yapraklardaki azot ve fosfor miktarı&nbsp; artmıştır. Verim ve kalite özellikleri bakımından N3 ve S2 uygulamaları en iyi sonucu vermiştir.&nbsp; Anahtar kelimeler: C vitamini, fertigasyon, suda çözünür kuru madde, pH, su tüketimi</div

Irrigation Scheduling and Fertigation of Pole Tomatoes by Using FAO-56 Penman-Monteith Method

Fertigation consists of application of irrigation water with plant nutrients to plants. Therefore, both application time and doses of plant nutrients and application time of irrigation and application amounts of water are highly important. Excess watering caused yield reduction because of leaching of plant nutrients below rooting depth and reverse effects of excess water to soil aeration while deficit irrigation caused yield losses because of plant water stress. In this study watering of tomatoes by FAO-56 Penman-Monteith Method which allows estimation of plant water evapotranspiration according to weather data and plant coefficients were carried out. Estimated evapotranspiration amounts for 1, 3 and 5 days intervals applied to tomatoes with a drip irrigation system. Sufficiency of amount of irrigation water applied was checked by monitoring soil water. According to the results, it was concluded that wetting ratio under drip irrigation for closely spaced plants should be higher near to 1. Watering of tomatoes with FAO-56 Penman-Monteith Method may be suitable but great fields are required for this method. And plant coefficient for a region must already be determined.</p

The Effect of Increasing Humic Acid Applications on Some Nutrient Contents of Cress (Lepidium sativum L.) Plant

This research was done to determine the effect of increasing Humic acid application on some nutrient element contents of cress (Lepidium sativum L.) plant. For this purpose according to randomize block experimental design, an experiment was done with three replications in greenhouse conditions. Cress plant seed was sowed 1.5 g/ m2. Four humic acid doses (I. dose: 0 mL /m2, II. dose: 8 mL /m2, III. dose: 16 mL /m2 and IV. dose: 24 mL /m2) were applied to cress plant. Then cress plants were harvested 30 days after planting. Dry matter yield and some nutrient (N, P, K, Ca, Mg, S, Fe, Cu, Zn and Mn) contents of plants were determined. According to the results, important increases some nutrient element contents of plants were determined with increasing humic acid applications. These increases were found 1. dose 5.52%, and 4. dose 6.04%, for N element, respectively. Other macro elements P (0.70%, and 0. 82%); K (6.85%, and 7.67%); Ca (1.72%, and 2.01%); Mg (0.13% and 0.15%) and S (1.04%, and 1.17%), respectively. Some micro element (Fe, Cu, Zn and Mn) contents of cress plant, 1. dose: 89.86, 9.59, 59.50 and 56.20; 4. dose: 102.17, 11.03, 67.67 and 76.63 mgkg-1, respectively. These increases were found statistically significant at the level of 5% for each nutrient element, except Mg