Masome shenavaei zare; Mohammad Armin; Hamid Marvi
Abstract
Nowadays, the use of stress modulators as a useful and low-cost solution to reduce the effects of environmental stress has been considered by researchers. In order to investigate the effects of stress modulator’s foliar application in different planting dates on yield and yield components of cotton, ...
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Nowadays, the use of stress modulators as a useful and low-cost solution to reduce the effects of environmental stress has been considered by researchers. In order to investigate the effects of stress modulator’s foliar application in different planting dates on yield and yield components of cotton, an experiment has been conducted as split-plot factorial in a randomized complete block design with three replications in Sabzevar Islamic Azad University in 2017 and 2018. Factors include planting date (early and late) as the main plot and type of stress modulator (control, salicylic acid (SA) 2 and 4 mM, glycine betaine (GB) 50 and 100 mM and sodium nitroprusside (SNP) 100 and 200 μM) as the sub-plots. Foliar application of 2 mM SA in the first year and 4mM SA in the second year produce the highest number of bolls per plant (10.1 and 7.58, respectively). In contrast, 4 mM SA spraying in early planting date increases seed cotton yield (45.6%), but in late planting date, seed cotton yield does not respond to the stress modulator application. In the first year, 100 μM SNP foliar application has the highest lint yield in both early and late planting dates, but in the second year, 2 mM SA foliar application produce higher lint yields. Overall, the results of this experiment show that the highest yield of cotton in saline conditions are obtained in sowing at the appropriate date and foliar application of 4 mM salicylic acid.
Mostafa Ebrahimikia; Matin Jami Moeini; Hamid Marvi; Yousef Hasheminejhad; Mohammad Ghasemzadeh Ganjehie
Abstract
To investigate the effects of row spacing and nitrogen application rate on growth and yield of quinoa, a split plot experiment has been conducted in a randomized complete block design with three replications in Sabzevar during 2018. The studied factors include row spacing at three levels (25, 50, and ...
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To investigate the effects of row spacing and nitrogen application rate on growth and yield of quinoa, a split plot experiment has been conducted in a randomized complete block design with three replications in Sabzevar during 2018. The studied factors include row spacing at three levels (25, 50, and 75 cm) and nitrogen application rate at four levels (0, 50, 100, and 150 kg N ha-1). Results show that the highest content of photosynthetic pigments, panicle length, number of seeds per plant, and biological yield belong to 150 kg N ha-1 treatment. However, the 100 kg N ha-1 treatment has had the highest number of panicles per plant (19.24) and 1000-seed weight (3.51 g). More row spacing has resulted in more chlorophyll contents, plant height, number of panicles, panicle length, and number of seeds per plant, but less 1000-seed weight, seed yield, and biological yield. The decrease in seed yield by increasing the row spacing to 50 and 75 cm has been 18.62 and 50.14%, respectively. The highest seed yield (6644.5 kg ha-1) has been produced via application of 150 kg N ha-1 at a row spacing of 25 cm. With increasing row spacing, nitrogen requirement to produce maximum seed yield declines. Thus, the highest seed yield in 75, 50, and 25 cm rows spacing are produced with the application of 50, 100, and 150 kg N ha-1, respectively. According to the results, the application of 150 kg N ha-1 and row spacing of 25 cm is recommended for planting quinoa, Sajama genotype.