Mohammad Feizi
Abstract
Quality degradation of some water resources in arid- and semi- arid regions of Iran is a major factor limiting plant growth and agricultural production. One imperative response to this challenge is proper use of saline water for agricultural activities. The present experiment was carried out on sugar ...
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Quality degradation of some water resources in arid- and semi- arid regions of Iran is a major factor limiting plant growth and agricultural production. One imperative response to this challenge is proper use of saline water for agricultural activities. The present experiment was carried out on sugar beet in southeast of Isfahan city, Iran, and comprised a completely randomized block design, with split-split plots and four replications. In this study, three irrigation water quality treatments of 1.6, 8.1 and 12.3 dS m-1(S1, S2 and S3, respectively) were assigned to the main plots. The sub-plots contained two different water management practices:(1)irrigating with the aforementioned three water qualities during the whole irrigation period and (2)similar the first treatment but irrigation with fresh water (1.6 dSm-1) during germination and establishment stages. In the sub-sub-plots, two leaching treatments were applied consisting of no leaching (LR0) and leaching amounts of 2.6%, 14.1%, and 19.6%, for S1, S2 and S3, respectively (LR1). The results showed that salinity of irrigation water significantly reduced white sugar yield (WSY) such that S2 and S3 treatments reduced WSY, respectively, 6.7 and 10 percent compared to S1 treatment. Root yield (RY) also decreased with increasing irrigation water salinity. Application of leaching significantly increased RY, WSY, and sugar yield. Statistical analysis indicated that, with higher levels of water salinity, the amounts of Na+, K+, and α-amino-N were significantly increased. Also, the molasses sugar increased with increasing salinity. Application of fresh water during initial period of growing season reduced the effect of saline water slightly in most of the yield component traits, whereas the effect of leaching application was significant on sugar beet yield components.
Mohsen Dehghani; Masoud Tadayonnejad; Mohammad Feizy
Abstract
In order to study the effect of irrigation frequency and water quality on yield and yield components of wheat, a study was conducted in Rodasht Agricultural Research Station, for 3 years. The experiment was laid in a randomized complete block design with three replications. Irrigation water quality ...
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In order to study the effect of irrigation frequency and water quality on yield and yield components of wheat, a study was conducted in Rodasht Agricultural Research Station, for 3 years. The experiment was laid in a randomized complete block design with three replications. Irrigation water quality treatments had electrical conductivities (EC) of 4, 8, and12 dSm-1 and were assigned to the main plot. Treatments of irrigation frequency were based on the percentage of management allowable depletion (30%, 50%, and 70%) and were allocated to the sub-plots. Statistical analysis results showed that the effect of irrigation water quality and irrigation frequency on the yield, water use, water use efficiency, weight of 1000 grains, and protein content was significant at the one percent level. The highest yield was produced by 30% management allowable depletion and 4 dSm-1irrigation water EC and reached 14593 kg.ha-1, while the lowest yield belonged to 70% management allowable depletion and 12 dSm-1 irrigation water EC yielding only 7347 kg.ha-1. The highest percentage of protein was related to the same treatment. The highest water use efficiency of 0.99 kg.m-3 belonged to 70% management allowable depletion and 4 dSm-1 irrigation water EC.