Akdeniz iklim kuşağında azola (Azolla mexicana-2026) bitkisinin aşılama zamanı ile kuru madde üretimi arasındaki ilişkisi

Azolla (Azolla anabaend) which is a aquatic fern plant is used as a green manure plant, organic matter and nutrition sources in many countries where the irragation water is no problem. There are many azolla genotypes which are adapted to warm zone in the world. A. mexicana-2026, one of them, has adapted Izmir-Menemen ecological conditions. The objective of this research was to determine the relation between inoculation time and dry matter of A. Mexicana-2026 in Izmir, Aydın and Antalya affected by Mediterranean climate in April, May September of 1999, 2000 and 2001 growing years. For each square meter 300 grams of fresh azolla was inoculated at each application time and harvested after 15 days from inoculation date. After harvesting, the highest dry matter weight was reached to 118.1 g/m2at İzmir location in April in 2001. Regression equation that gave the relation between inoculation time and dry matter on azolla plant in the Mediterranean regions found as $Y_{izmir}$ =0.01297 $Z^2$- 2.5029 Z + 118.2293, $Y_{aydın}=0.008879$Z^2$-1.6982 Z + 87.2049 and$Y_{antalya}$=0.0009751$Z^2$-1.8957 Z + 90.9501.Sucul bir eğrelti otu olan azola (Azotta anabaena), sulama suyunun problem olmadığı birçok ülkede yeşil gübre bitkisi, organik madde ve bitki besin kaynağı olarak kullanılmaktadır. Dünyada ılıman iklim kuşağına uyum gösteren, azola türlerine ait birçok genotip mevcuttur. A. Mexicana-2026 bunlardan biri olup İzmir-Menemen Ekolojik koşullarına uyum sağlamıştır. Bu çalışmada A. Mexicana-2026'mn; 1999-2000 ve 2001 yıllarında, Akdeniz iklimi etkisinde kalan İzmir, Aydın ve Antalya lokasyonlarında aşılama zamanı-kuru madde ilişkisinin belirlenmesi amaçlanmıştır. Her lokasyonda nisan, mayıs ve eylül aylarında metrekareye 300 gr taze azola aşılanmıştır. Aşılamadan 15 gün sonra hasat edilmiştir. En yüksek kuru madde ağırlığı İzmir lokasyonunda l Nisan tarihinde 118.1 gr/m2 elde edilebileceği tahmin edilmiştir. İzmir, Aydın ve Antalya lokasyonunda aşılama zamam-kuru madde ilişkisini veren regresyon denklemi sırasıyla$Y_{izmir}$=0.01297$Z^2$- 2.5029 Z + 118.2293,$Y_{aydın}$=0.008879$Z^2$-1.6982 Z + 87.2049 ve$Y{antalya}$=0.0009751$Z^2$-1.8957 Z + 90.9501 bulunmuştur

Effects of salt stress on some physiological characters of rice (Oryza sativa l.) in germination and seedling stages

Effects of salts stress on seven rice genotypes (Osmancık, Kıral, Yavuz, Demir, Baldo, IR4630, IR31785) were investigated at the seedling and germination stages. The highest reduction in dry weight was recorded for Demir and Krai while the lowest was in Yavuz. Salt treatment increased the Na+/K+ ratio in all genotypes. Germination ratio, chlorophyll and relative water content (RWC) were decreased by increasing salt levels. The genotypes showed parallel response to salt stress at the germination and seedling stage.Effects of salts stress on seven rice genotypes (Osmancık, Kıral, Yavuz, Demir, Baldo, IR4630, IR31785) were investigated at the seedling and germination stages. The highest reduction in dry weight was recorded for Demir and Krai while the lowest was in Yavuz. Salt treatment increased the Na+/K+ ratio in all genotypes. Germination ratio, chlorophyll and relative water content (RWC) were decreased by increasing salt levels. The genotypes showed parallel response to salt stress at the germination and seedling stage