Topraksız kültürde besin çözeltisindeki N:S oranlarının domates bitkisinin gelişimi, fotosentetik pigmentleri ve makro besin içeriği üzerine etkileri

Öz

Bu çalışmada, topraksız yetiştiricilikte besin çözeltisindeki Azot (N) : Kükürt (S) oranındaki değişimin domates bitkisinde gelişme, makro besin kapsamı ve fotosentetik pigmentler üzerine etkisi incelenmiştir. Denemede 2:1 torf: perlit (v/v) karışımından her saksı için 1500 gram alınıp 3 litrelik saksılara konulmuştur. Her saksıya bir domates fidesi (Kardelen F1 çeşidi) dikilmiştir. Bitkilere farklı N ve S konsantrasyonlarına (mM) sahip besin çözeltisi uygulamaları [I) 12.5:0.125 (N12.5:S0.125), II) 11.5:0.625 (N11.5:S0.625), III) 10.5:1.125 (N10.5:S1.125), IV) 9.5:1.625 (N9.5:S1.625)] yapılmıştır. Deneme tamamen tesadüfi deneme desenine göre üç tekerrürlü olarak yürütülmüştür. Besin çözeltisindeki N:S dengesindeki değişimin, bitkinin gövde ve yaprak kuru ağırlığı üzerine etkisi önemli bulunurken; bitkinin kök kuru ağırlığı, boyu, bitki gövde çapı, bitki yaprak sayısı üzerine etkisi önemsiz bulunmuştur. Azotun azaltılırken kükürtün arttırıldığı besin çözeltisi uygulaması yaprakta klorofil-a, klorofil-b ve toplam klorofil kapsamlarını azaltmıştır. En yüksek klorofil-a, klorofil-b ve toplam klorofil içeriği N12.5:S0.125 uygulamasında; en düşük ise N9.5:S1.625 uygulamasında elde edilmiştir. Besin çözeltisindeki N:S oranındaki değişimin, yaprakta N, K, Ca, Mg ve S kapsamına etkisi önemli iken; P kapsamına etkisi önemsiz bulunmuştur.

Anahtar Kelimeler

• Domates
• topraksız kültür
• N/S sitokiyometrisi
• gelişme
• fotosentetik pigmentler

The effects of N:S ratios in nutrient solution on the growth, photosynthetic pigments and macronutrient content of tomato plants in soilless culture

Öz

In this study, the effects of changes in the N (Nitrogen) : S (Sulphur) ratio of the nutrient solution in soilless cultivation on the growth, macronutrient content, and photosynthetic pigments of tomato plants were investigated. One thousand five hundred grams (1500 g) of the substrate (2:1 peat: perlite (v/v) mixture) was added to each 3-litre pot. A tomato seedling (Kardelen F1 variety) was planted in each pot. Plants were fed with nutrient solution treatments [I) 12.5:0.125 (N12.5:S0.125), II) 11.5:0.625 (N11.5:S0.625), III) 10.5:1.125 (N10.5:S1.125), IV) 9.5:1.625 (N9.5:S1.625)] with different N and S concentrations (mM). The study was conducted with three replicates according to a completely randomized experimental design. The effect of the changes in N:S balance in the nutrient solution on the stem and leaf dry weight of the plant was significant, while its effect on the root dry weight, plant height, stem diameter, and leaf number of the plant was not significant. The increase in S concentration and the simultaneous decrease in N concentration in the nutrient solution reduced the content of chlorophyll-a, chlorophyll-b, and total chlorophyll in the leaf. The highest levels of chlorophyll-a, chlorophyll-b, and total chlorophyll were obtained in treatment N12.5:S0.125 and the lowest in treatment N9.5:S1.625. The effect of the change in N:S ratios in the nutrient solution on the N, K, Ca, Mg, and S content in the leaves was found to be significant, while the effect on the P content was not significant.

Anahtar Kelimeler

• Tomato
• soilless culture
• N/S ratio
• growth
• photosynthetic pigments

Kaynakça

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