Erdinç SAVAŞLI, Oğuz ÖNDER, Ramis DAYIOĞLU, Didem ÖZEN, Suat ÖZDEMİR, Yaşar KARADUMAN, Özgür ATEŞ, Melih ÖZSAYIN

A Calibration Study for Sensor-Based In-Season Nitrogen Management of Irrigated Winter Wheat

This study was conducted at Transitional Zone Agricultural Research Institute in Eskisehir, in 2017-2019 growing seasons. In the study, responses of four winter wheat cultivars (Atay85, Hat 31, Yunus and Nacibey) to nitrogen fertilization under irrigation conditions were compared with vegetation indices based on spectral reflection and In-Season Estimates of Yield calculated from these indices. GreenSeekerTM(NTech Industries,Inc.,Ukiah,CA) hand-held sensor was used for this purpose. The experimental layout were used 0, 4, 8, 12, 16 and 20 kg N/da nitrogen rates 2 factor factorial in randomized complete block design in the experiment. Vegetation indices (NDVI) were obtained at growth stagesZadoks2,4, Zadoks3,0, Zadoks3,1 and Zadoks3,2. Zadoks3,0 (stem elongation)was found to be the most realistic reading time. A comparison of the system with traditional farmer applications, based on the average of 3 experiment fields, the new systemwas shown to give similar yields with 2,8 kg/da less N in the spring (ZD3,0), showing its economically promising value. The sensor application is determined to be 2% more economically effective than farmer application. Economic nitrogen dose respectively Atay85,Hat 31, Yunus and Nacibey was determined as the nitrogen dose 12,6 kgN/da, 14,1 kgN/ da, 14,4 kg N/da and 17,9 kgN/da.

Sulu Şartlar İçin Geliştirilen Ekmeklik Buğday Çeşitlerine Optik Sensör ile Azotlu Gübre Tavsiyesi

Bu çalışma, 2017-2019 yılları arasında Eskişehir Geçit Kuşağı Tarımsal Araştırma Enstitüsü arazisinde yürütülmüştür. Çalışmada, dört kışlık (Atay85, Hat 31, Yunus ve Nacibey) buğday çeşidinin sulu koşulları altında azot gübrelemesine verdikleri tepkiler, spektral yansımaya dayalı bitki örtüsü indeksleri ve bu endekslerden hesaplanan Mevsimsel Verim Tahminleri ile karşılaştırılmıştır. Bu amaçla GreenSeekerTM (NTech Industries, Inc., Ukiah, CA) el tipi sensör kullanılmıştır. Deneme, Tesadüf Bloklarında Faktöriyel deneme deseninde ve 6 farklı 0, 4, 8, 12, 16 ve 20 kg N/da azot oranları kullanılmıştır. Vejetasyon indeksleri (NDVI) Zadoks2.4, Zadoks3,0,Zadoks3,1 ve Zadoks3,2 büyüme dönemlerinde okunmuştur. Zadoks3,0 (sapa kalkma dönemi) en gerçekçi okuma dönemi olarak belirlenmiştir. Sistemin geleneksel çiftçi uygulamaları ile karşılaştırıldığında, 3 deneme ortalamasına göre, yeni sistemin, ilkbahar dönemi azot uygulamalarında 2,8 kg/da daha az N (ZD3,0) ile benzer verimler sağladığı ve ekonomik açıdan ümit verici olduğunu görülmüştür. Sensör uygulamasının çiftçi uygulamasından % 2 daha ekonomik olarak etkin olduğu belirlenmiştir. Ekonomik azot dozu sırasıyla Atay85, Hat 31, Yunus ve Nacibey 12,6 kg N/da, 14,1 kg N/da, 14,4 kg N/da ve 17,9 kg N/da azot dozu olarakbelirlenmiştir.

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