Hasan Ali Pooresmaeil; Mahdi Dahmardeh; Ahmad Ghanbari
Abstract
Objective: More than 60% of Iran's agricultural land consists of arid and semi-arid soils, which are poor in organic matter and subjected to severe degradation and erosion. Therefore, in order to evaluate the effect of the integrated organic fertilizer management systems on the quality forage of corn, ...
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Objective: More than 60% of Iran's agricultural land consists of arid and semi-arid soils, which are poor in organic matter and subjected to severe degradation and erosion. Therefore, in order to evaluate the effect of the integrated organic fertilizer management systems on the quality forage of corn, the physicochemical characteristics of the soil and the environment in two stages of growth, an experiment was conducted in the research farm of Zabol University.Methods: An experiment was conducted as factorial based on a randomized complete block design with three replications in the year 2016-17 cropping year. The first factor included 10 organic fertilization levels: (without fertilization, 30% wheat residue, 60% wheat residues, 90% wheat residues, 30% vermicompost, 60% vermicompost, 100% vermicompost, 10% vermicompost + 90% wheat residues, 40% of vermicompost + 60% of wheat residues and 70% vermicompost + 30% of wheat residues) and the second factor of harvesting time were at two levels: (harvest in milky and dough stages). In this study, traits were investigated in three sections including the qualitative characteristics of corn forage (percentage of protein and protein yield, water-soluble carbohydrates), ecological environment characteristics (percentage of volumetric moisture, photosynthetically active radiation, and soil temperature), and physicochemical properties of soil (EC, pH, and soil porosity).Results: The results of analysis of variance showed that the effect of interaction between harvesting stage and integrated organic fertilizer management systems on water-soluble carbohydrates was significant. Also, the simple effect of harvesting stage and integrated organic fertilizer management system on crude protein and protein yield was significant. The highest crude protein (12.09%) and protein yield (629.51 kg ha-1) were obtained in milk line stage, While the highest crude protein (11.55%) and protein yield (769 kg ha-1) were obtained when applying of 70% vermicompost and 30% of wheat residues. Mean comparisons showed that the highest water-soluble carbohydrates (16.22%) were obtained in the dough stage of grain and under the application of 70% vermicompost and 30% of the wheat residues. The lowest soil temperature (33.64 °C) and the highest percentage of photosynthetically active radiation (81.79%) were observed under the application of 70% vermicompost+ 30% wheat residue, in the milk line and dough stage of corn kernels, respectively. Based on the results, the integrated system of 70% vermicompost+ 30% wheat residues caused a significant decrease in acidity (7.97) and soil electrical conductivity (2.18 ds m-1). Application of 100% vermicompost and integrated system of 70% vermicompost+ 30% residues showed the highest percentage of soil porosity (46%).Conclusion: In general, according to the results of this research, the integrated system of 70% vermicompost+ 30% plant residues was significantly superior compared to other fertilizer systems. Therefore, it is better to consider the application ratio of vermicompost double that of plant residues in the integrated system. Also, considering the importance of harvesting stage in the digestibility and palatability of forage, the most suitable time to harvest corn forage is the milk line stage of corn kernels.
sara Najafi; Issa Khammari; ahmmad ghanbari; mahdi dahmard
Abstract
Additive intercropping series of sunflower and basil have been laid out under salty and fresh water irrigation management with the aim of achieving the highest yield and intercropping advantage as a result of intercropping the two plants. An experiment has been performed at Zabol University during two ...
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Additive intercropping series of sunflower and basil have been laid out under salty and fresh water irrigation management with the aim of achieving the highest yield and intercropping advantage as a result of intercropping the two plants. An experiment has been performed at Zabol University during two cropping years (2018 and 2019). Fresh water (ECe = 3.9 dS.m-1) and saline water (ECe = 1.1 dS.m-1) have been taken from the Hirmand River and a local well, respectively. The irrigation water regimes are fresh water, salt water, and an alternating usage of salty and fresh irrigation water. In addition, five types of intercropping patterns are considered the sub-factors (100% sunflower (4 plants/m2), 100% basil (80 plants/m2), 100% sunflower+ 50% basil, 50% sunflower + 100% basil and 100% sunflower + 100% basil. The results show that the interaction between intercropping patterns and different irrigation regimes has had a significant effect on 1000 seed weight, seed yield, harvest index, oil yield of sunflower, dry weight, and essential oil yield of basil plants. In response to all irrigation regimes, the highest value of total land equivalent ratio (1.37-1.45) and intercropping advantage (0.29 - 0.48) has occurred as a result of cultivating 50% sunflower + 100% basil, thereby appearing as a good model of intercropping. The results show that intercropping patterns can be effective in modulating the negative effects of saline irrigation water on plant yield.