In this study the effects of rootstocks on watermelon fruit quality and yield were investigated by comparing grafted plants with non-grafted and self-grafted ones in open field conditions in over two consecutive years (2013-2014). The watermelon cultivar Crimson Tide was grafted onto Ferro RZ, Maximus, Nun 9075, RS 841, No:3, Strong Tosa and TZ 148 rootstocks. Non-grafted and self-grafted plants were used as control. Grafting increased the average fruit yield between 17.45% and 52.56% compared to non-grafted treatment. It was concluded that among the tested rootstocks No:3 along with Nun 9075 and TZ 148 rootstocks can be advised due to the increase in fruit yield, total soluble solids and taste panel test values and that the use of grafted plants can be advantageous alternative in watermelon production for producers.

Planting date in relation to subsequent crop development and yield are important determinants in realizing crop yield potential. This study was conducted to determine optimum planting dates for Oklahoma adapted maturity groups of soybean [Glycine max (L.) Merr.]. Effects of planting date on yield were investigated at Bixby, OK, in tbe Uniform Soybean Tests for Southern States. Field experiments were conducted from 1958 through 1994. Planting dates across years ranged between 10 May and 1 July, and were assigned to 5‐d, planting intervals. Maturity groups IV, V, and VI were evaluated. Soil type was a Wynona silty clay loam (fine‐silty, mixed, thermic Cumulic Haplaquoll). Significant interaction occurred between maturity group and planting interval for yield. Highest average yields produced by maturity group IV (2248 lb/acre) occurred with 9 to 18 May and 8 to 22 June planting intervals. Lowest average yields for maturity group IV (1524 lb/acre) occurred with 19 May to 7 June planting intervals. Highest average yields for maturity group V (2573 lb/acre) occurred with 14 to 18 May and 13 to 22 June planting intervals, and lowest average yields (1950 lb/acre) with 19 May to 12 June planting intervals. Maturity group VI produced highest average yields (2501 lb/acre) with 14 to 18 May, 3 to 7 June, and 13 to 22 June planting intervals. Maturity group VI yields for all other planting intervals averaged 2073 lb/acre. During the range of planting dates available from early May to early July, for maturity groups IV, V, and VI, definite optimum planting dates occur for highest yields. Knowledge of optimum planting dates can be one crop management tool applied to enhance crop productivity, facilitate cropping patterns, and better utilize environmental conditions. Problem Determining optimum planting dates for maximum seed yield is fundamental for successful crop production. This study was conducted to identify optimum planting dates based on seed yield for adapted maturity groups. Background Growers have a relatively long period between early May and early July for planting soybean in Oklahoma. Different maturity groups may produce different seed yields and change in relative rank for various dates of planting. This requires evaluation of maturity groups within planting dates and planting dates within maturity groups rather than considering either maturity group or planting date alone. Identification of optimum planting dates for different maturity groups would enable minimizing the effects that temperature, water stress and photoperiod may have on seed yield. Study Description This study was conducted from 1958 through 1994 on a Wynona silty clay loam at the Oklahoma Vegetable Research Station in Bixby, in the Uniform Soybean Tests for Southern States. Genotypes used each year were dependent upon entries in the Uniform Soybean Tests. Maturity groups IV, V, and VI were included. Maturity group IV contained both determinate and indeterminate genotypes. Maturity groups V and VI consisted of only determinate genotypes. All matu...

ÖZETBu çalışmada hasar verilmiş kemerlere uygulanan değişik FRP ile güçlendirme teknikleri deneysel olarak incelenmiştir. Yedi adet kemer numunesi, pres tuğla ve tarihi yapılardaki harca benzer kireç esaslı düşük dayanımlı harç kullanılarak imal edilmiştir. Yeterli dayanıma ulaşan (28 gün dayanımı) kemerlerden, referans olarak adlandırılan numune göçme anına kadar yüklenmiş, diğer numunelere de belli oranda hasar verilmiştir. Sonra farklı boyutlardaki FRP şeritleri, ankraj uygulamaları ve derz dolgu tekniğini içeren altı farklı güçlendirme tekniği altı kemer numunesi üzerinde teste tabi tutulmuştur. Güçlendirme tekniği uygulanan hasar verilmiş kemer numuneler, ticari bir yapısal analiz programı kullanılarak nümerik olarak modellenmiş ve deneysel sonuçlarla nümerik sonuçlar karşılaştırılmıştır. Elde edilen sonuçlar, güçlendirilmemiş referans numunesine oranla güçlendirilmiş kemer numunesi kapasitesinin en az %58 arttığını ve aynı zamanda kemer derzlerinin yalnızca epoksi reçinesi ile güçlendirilmesinin hasar görmüş tuğla kemer kapasitesini artırmada etkili bir alternatif olduğunu göstermiştir. INVESTIGATION OF FRP EFFECTS ON DAMAGED ARCHES IN HISTORICAL MASONRY STRUCTURES ABSTRACTThe present paper deals with experimental behavior of deformed brick masonry arches strengthened with the fiber reinforced polymer (FRP). Seven arches were fabricated using commercial clay brick and low strength lime-based mortar, trying to mimic historical structures. After reaching sufficient strength (28 day strength), one arch called reference specimen is tested under the ultimate load and other arches are given damage to a certain extent. Then six different strengthening arrangements, including different dimensions of FRP strips, spike anchors and joint grouting are implemented on six arches damaged. The numerical modeling of damaged masonry arches strengthened with FRP is performed using a commercially available structural analysis program and the numerical results are compared with the experimental ones. The experimental results show that the capacity of damaged masonry arch strengthened increases at least 58% in comparison with unstrengthened masonry arches and strengthening of joints with epoxy resin is an effective alternative to increase the damaged masonry arch capacity.

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