fatemeh abbaspour; hamidreza asghari; P Rezvani Moghaddam; hamid abbasdokht; javad shabahang; adel baig babaei
Abstract
A field experiment was conducted which focused on the effects of walnut wood biochar and chemical fertilizers on quality characteristics of Black Seed (Nigella sativa) under water deficit conditions. The experiment was carried out in a split plots factorial layout based on a randomized ...
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A field experiment was conducted which focused on the effects of walnut wood biochar and chemical fertilizers on quality characteristics of Black Seed (Nigella sativa) under water deficit conditions. The experiment was carried out in a split plots factorial layout based on a randomized complete block design with three factors and three replications. Three levels of irrigation (I1: 100%, I2: 70% and I3: 40% of crop water requirement) were assigned as the main plots and the combination of three levels of biochar (B1: 0, B2: 10 and B3: 20 t.ha-1) and two levels of chemical fertilizers (F1: without and F2: with chemical fertilizer) were allocated to sub plots. Recommended dose for nitrogen, phosphorus, and potassium was 150 kg N.ha-1, 75 kg P2O5.ha-1 and 100 kg K2SO4.ha-1, respectively. Results showed that irrigation had no effect on soil properties, but application of 20 t ha-1 of biochar improved soil saturation percentage, soil organic carbon, and total nitrogen. Irrigation significantly influenced the seed yield, oil yield, oil percentage, and fatty acids, except oleic acid. The 70% water requirement treatment increased the amount of fatty acids, except stearic acid. Plant quality characteristics significantly increased by 10 t ha-1 biochar application. Application of 10 t ha-1 biochar plus 70% irrigation water requirement and using chemical fertilizer (I2B2F2) produced the highest seed yield (1158.4 kg ha-1). Based on the results, it seems that application of 10 t ha-1 biochar is suitable for black seed production under water deficit condition.
h m; a a; h a; p r
Abstract
To study the effects of irrigation water (50%, 75%, and 100% of plant water requirement) and potassium fertilizer (0, 50%, and 100% required potassium fertilizer based on soil test) on the dynamics of root, yield, and shoots of sorghum varieties (Pegah, Karaj, and Speedfeed), a research was conducted ...
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To study the effects of irrigation water (50%, 75%, and 100% of plant water requirement) and potassium fertilizer (0, 50%, and 100% required potassium fertilizer based on soil test) on the dynamics of root, yield, and shoots of sorghum varieties (Pegah, Karaj, and Speedfeed), a research was conducted in the Agricultural Research Center of Semnan province (Shahrood) in 2014. This research was conducted in pots and in field experiment. The experimental variables were irrigation water, potassium fertilizer, and varieties of forage sorghum. The treatments were arranged as split plots based on a randomized complete block design with three replications. In the pot experiment, 243 plastic pots with diameter of 30 and height of 60 cm were used. Irrigation water was calculated with Penman-Monteith method. Drip irrigation was used as irrigation system. Sampling was carried out from the roots in three phases during the season. The root volume was determined by immersion in water method. Shoots parameters such as leaf area, leaf dry weight, stem dry weight, and shoot weight were measured. The results showed that the effects of irrigation water, potassium fertilizer, and sorghum varieties were significant on the forage yield, root volume, and dry weight of roots and shoots of the plants. The highest yield was obtained from the W100K100 treatment (102.8 ton/ha). Pegha variety showed the maximum yield. The maximum water use efficiency was obtained from the W75K100 treatment (20.5 kg/m3/ha). The W75K100Vp < /sub> treatment was introduced as a superior treatment. Potassium fertilizer could compensate the loss of yield. The mathematical equations expressing root volume and dry weight with time were determined during the season. The relationships between some parameters of the shoots and roots were determined.