Effect of potassium amount on reducing the effects of salinity stress in Common purslane (Portulaca oleracea L.)
Subject Areas :
mohamadreza salehabadi
1
(دانش آموخته کارشناسی ارشد زراعت، گروه زراعت و اصلاح نباتات، واحد سبزوار، دانشگاه آزاد اسلامی ، سبزوار، ایران)
mohamad armin
2
(دانشیار، گروه زراعت و اصلاح نباتات، واحد سبزوار، دانشگاه آزاد اسلامی، سبزوار، ایران)
matin jamimoeini
3
(استادیار، گروه زراعت و اصلاح نباتات، واحد سبزوار، دانشگاه آزاد اسلامی، سبزوار، ایران)
Keywords: Salinity, Medicinal plant, Potassium, Common purslane,
Abstract :
In salt stress conditions, the use of moderating substances such as potassium-containingfertilizers can reduce the negative effects of saline on yield and yield components of crops.The objective of this study was to determine the effect of potassium amount on yield andyield components of Common Purslane (Portulaca oleracea L.) grown under salt stress.The study was conducted in pot experiments under greenhouse conditions in Sabzevarbranch, Islamic Azad university in 2016. A factorial experiment was carried based oncompletely randomized design with three replication. Factors were: amount of potassium(0. 150 and 300 kg k2O ha-1) as Solopotash form and salinity levels (0, 6, 9 and 12 dS.m-1).The results showed that increasing potassium amount in salt stress conditions increasedthe yield and yield components of Common purslane and the highest plant height, numberof lateral branches, number of capsule per plant, number of seeds per capsule, dry weightof plant, grain yield, potassium content and lowest amount of sodium was obtained byconsuming 300 kg. ha-1. Salinity at 12 dS.m-1 level, 57.75% reduced plant height, 55.75%number of lateral branches, 37.27% capsules per plant, 68.56% seeds per capsule, 67.57%1000 seed weight, 71% plant dry weight, 47.21% grain yield and 41.91% plant potassiumcontent and increased 27.65% sodium content compared to control. In total, the resultsshowed that till 9 dS.m-1 grain yield was not statistically significant and consumption of300 kg.ha-1 was more suitable for reducing the effects of salinity stress.
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