Document Type : Complete scientific research article
Authors
1
PhD student in Agriculture, Department of Agriculture, Khorramabad Branch, Islamic Azad University, Khorramabad, Iran.
2
Assistant Prof., Crop and Horticultural Science Research Department, Lorestan Agricultural and Natural Resources Research and Education Center, AREO, Khorramabad, Iran
3
Associate Prof., Department of Agronomy, Khorramabad branch, Islamic Azad University, Khorramabad, Iran
4
Assistant Prof., Department of Agronomy, Khorramabad branch, Islamic Azad University, Khorramabad, Iran.
Abstract
Background and Objectives
In many regions of the country, including Khorramabad, Lorestan, the amount, distribution, and intensity of rainfall has a negative effect on the production of crops such as vetiver in rainy conditions. Conservation tillage is considered a suitable solution for storing moisture and preserving the soil. Also, the selection of high-potential variety and adaptation to the weather conditions of the region, while increasing the production, helps the economy of the farmers in the region. On the other hand, it seems necessary to find suitable practical solutions such as salicylic acid to adjust the drought stress. For this purpose, the simultaneous investigation of tillage, variety and salicylic acid was investigated in this experiment in order to achieve the best treatment for the dry conditions of the region.
Materials and methods
In order to investigate the quantitative and qualitative response of vetiver to tillage and salicylic acid, an experiment was conducted in three tillage environments including conventional, low tillage, and no tillage with two varieties of vetiver, Maragheh and Gachsaran, and four levels of salicylic acid foliar application including the control. , 0.5, 1, and 1.5 millimolar were implemented in Kamavand area of Khorram Abad city in two crop years 1395-1396 and 1396-1397.
Results
The results showed that the highest yield of dry fodder (2340 kg/ha) was obtained from two protective tillage methods, but the highest harvest index (25.2%) was obtained from the conventional tillage method. Comparison of cultivars showed that Maragheh variety had a significant advantage over Gachsaran cultivar in terms of all morphological traits except the weight of 1000 seeds, but no significant difference was observed between the two cultivars in terms of harvest index. The highest amount of morphological traits including plant height, wet and dry forage yield, forage moisture percentage, grain yield components, grain yield, biological and straw yield and harvest index were obtained from the application of 1.5 mM salicylic acid. In the first year, the highest fodder yield was obtained from the low tillage method in the Maragheh cultivar with foliar spraying of 0.5 mM salicylic acid (15419 kg/ha) and in the second year, from the low tillage method in the Maragheh cultivar with Foliar spraying of 0.1 mM salicylic acid (16059 kg/ha) was obtained without significant difference with other levels of foliar spraying. In the first and second year, the highest seed yield from the low tillage method in Maragheh cultivar with 1.5 mM salicylic acid (1191 and 1320 kg/ha respectively) and the lowest seed yield from the low tillage method. Cultivation in Gachsaran cultivar was achieved without or with 0.5 mM salicylic acid (389 and 542 kg/ha respectively) or without foliar application.
Conclusion
In general, Maragheh cultivar is recommended in the low tillage method with salicylic acid spraying for the dual purpose production of fodder and seeds in vetiver.
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