Fall N fertilizers are applied to turfgrass at predetermined rates instead of being based on plant-N status. Normalized difference vegetative index (NDVI) and the sufficiency index (SI) concept are used to assess plant-N status in some agronomic crops but has not been evaluated for turfgrass. This study was conducted across 3 yr in Connecticut to determine fall and spring NDVI SI values in a mixed species, cool-season lawn. Field experiments were set out with varying fall N rates with NDVI measured weekly in October and November, and in late April. Quadratic and Linear-Response and Plateau (LRP) models were significant (P < .0001) for all fall and spring SI values in response to fall N rates. Fall SI was maximized between 140 and 155 kg N ha −1 for the quadratic model and plateaued between 79 and 102 kg N ha −1 for the LRP model. Spring SI was maximized at 189 and plateaued at ≥116 kg N ha −1 for quadratic and LRP models, respectively. In relation to commonly recommended fall N rates of 24.5, 49, and 98 kg N ha −1 , the models suggest that no supplemental N is needed when SI is ≥92, ≥95, and ≥99% of the N-rich reference in the fall, respectively. Late April SI >89% of spring N-rich reference would indicate that excess fertilizer was applied the previous fall at rates >49 kg N h −1. The NDVI SI can provide site-specific fall N fertilization guidance of cool-season turfgrass lawns.

The objectives of the present study were to determine the effects of the rate and timing of the application of sun-dried wastewater sludge from a food processing company's wastewater system on turfgrass growth and quality. The results were compared with those obtained with ammonium nitrate, and changes in the concentration of heavy metals and the presence of fecal coliform in turf soils after sun-dried wastewater sludge application were determined. The rate and the timing of sun-dried wastewater sludge and ammonium nitrate applications affected the turf color, quality, and clipping yield. Monthly fertilization resulted in a more uniform color and turf quality than infrequent spring and fall fertilization. Compared with the background values of base soils, heavy metals did not accumulate in sun-dried wastewater sludge-amended soils over the test period. Fecal coliform was not detected in sludge-amended soil samples, indicating that bacteria regrowth did not occur during the study period.

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2 The current study addresses the effects of topdressing composted chicken manure on established turf and comparing the composted chicken manure to a chemical nitrogen (N) fertilizer. Turf color, quality and clipping yields were correlated with N sources and application timing. Monthly fertilization resulted in a more uniform color and turf quality and less clipping yields than did comparable amounts of all N sources applied each as a single application in spring and spring and fall (S + F). The monthly and/or S + F topdressing of chicken manure composts increased the color and quality ratings of the turf mixture during the growing season but did not greatly affect the clipping production.

Products in Control of Fusarium Blight (Fusarium spp.) Disease on The Cool-Season Turfgrasses ÖZ Amaç: Bu araştırmada, çim bitkilerinde en yaygın görülen hastalıkların başında gelen Fusarium solgunluğu etmenlerine karşı bazı bitki koruma ürünleri ile etkililik denemeleri gerçekleştirilmiştir. Materyal ve Yöntem: Araştırmanın materyalini hastalıklı çim bitkilerinden izole edilen ve tanılanmış olan Fusarium izolatları, serin iklim çim bitkisi türleri ve 1'i bitki aktivatörü, 2'si fungisit olan 3 preparat oluşturmaktadır. Çalışmada, 30.09.2015 ve 06.10.2016 tarihlerinde tesadüf parsellerinde bölünmüş parseller deneme desenine göre 4 tekerrürlü olarak iki tekrarlamalı deneme kurulmuştur. Bulgular: Çalışma bulgularına baktığımızda tüm ölçümlerde ilaç uygulamalarının, türlerin hastalık şiddeti üzerine etkisinin istatistiki açıdan %1 olasılık düzeyinde önemli olduğu görülmüştür. Muamele x Tür interaksiyonunun hastalık şiddeti üzerine etkisi tüm ölçümlerde istatistiki açıdan %1 olasılık düzeyinde önemli bulunmuştur. Sonuç: Bu çalışma sonucunda denemede kullanılan Lactobacillus acidophilus fermantasyon ürünü (Soil-Set), Tolclofos-methyl+Thiram (Sumiriz-T) ve Prochloraz+Tebuconazole (Zamir) bitki koruma ürünlerinin etkililikleri arasındaki fark çok yüksek seviyelerde bulunmamakla birlikte Sumiriz-T nin daha etkili olduğu görülmüştür.