Browsing by Author "Naderi, Ruhollah"
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Item Nitrogen, manure and municipal waste compost effects on yield and photosynthetic characteristics of corn (zea mays l.) under weedy conditions(Uludağ Üniversitesi, 2013-12-09) Naderi, Ruhollah; Ghadiri, HosseinA two-year field experiment was carried out to investigate the effects of nitrogen, composted manure, municipal waste compost, and weeds on yield and photosynthetic characteristics of corn. Experimental design was split split plot factorial with 3 replications. Main plots were weedy and weed-free, sub plots were nitrogen fertilizer levels [0 (N0) and 200 (N200) kg N ha -1 as urea], and sub sub plots were factorial application of municipal waste compost [0 (C0), 25 (C1) and 50 (C2) t ha -1 ] and manure [0 (M0), 25 (M1) and 50 (M2) t -1 ha ] with all possible combinations. Manure and municipal compost increased photosynthetic rate (A) (27 and 7 %, respectively), stomatal conductance (gs) (12 and 25 %, respectively) and chlorophyll content of corn leaves same as nitrogen fertilizer. There was no significant difference between C2+M2 and C2+M2+N200 for corn yield. Weed presence significantly decreased A, gs, chlorophyll content, and yield of corn. Increase in organic or inorganic fertilizers did not decrease the detrimental effect of weeds on corn. Our results showed these organic amendments are valuable potential as nutrient sources for corn production and allow our farmers to recycle livestock and municipal waste products; however, they could also increase weed competition. These findings can use to improve organic fertilization as an essential part of integrated weed management.Item Water stress and plant within row spacing effects on safflower yield in competition with wild oat(Uludağ Üniversitesi, 2015-10-08) Naderi, Ruhollah; Kazemeini, Seyed Abdolreza; Noroozi, MajidA Two-year field experiment was carried out in 2009 and 2010 at Agricultural College of Shiraz University, Iran to evaluate the effects of different water stress and plant within row spacing on safflower yield and photosynthetic characteristics in weedy conditions. Results showed that drought stress at 75 % FC (field capacity) caused a reduction of 15 % in seed yield but this treatment had no significant difference with well watered. Yield reduction of 31 % was also observed at 50 % FC. The greatest seed yield was also found at plant within row spacing of 5 cm (302.6 ±23 kg m-2 ). The yield reduction caused by weed competition was 57%. Compared to well water, at 75 % FC and 50 % FC Photosynthesis rate of safflower reduced 26.18 and 65.49 %, respectively. Weeds competition reduced safflower photosynthesis rate significantly about 25 %. Transpiration in weedy plots was also significantly lower than that of weed free plots (33%). Compared to well-watered, water stress at 75 % and 50 % FC reduced wild oat biomass by 29 % and 43 %, respectively. Increasing within row spacing from 5 cm to 10 cm and 20 cm caused an increase in wild oat biomass by 30% and 40%, respectively.