Murdoch University Research Repository

Welcome to the Murdoch University Research Repository

The Murdoch University Research Repository is an open access digital collection of research
created by Murdoch University staff, researchers and postgraduate students.

Learn more

Canola, narrow-leafed lupin and wheat differ in growth response to low–moderate sodium on a potassium-deficient sandy soil

Ma, Q. and Bell, R.ORCID: 0000-0002-7756-3755 (2016) Canola, narrow-leafed lupin and wheat differ in growth response to low–moderate sodium on a potassium-deficient sandy soil. Crop and Pasture Science, 67 (11). pp. 1168-1178.

Link to Published Version:
*Subscription may be required


Although soil salinity and potassium (K) deficiency are widespread in agricultural lands, there is a paucity of knowledge about the interactive effects of sodium (Na) and K on the growth and yield of major grain crops. In pot experiments, we examined salt tolerance of canola (Brassica napus L.), narrow-leafed lupin (Lupinus angustifolius L.) and wheat (Triticum aestivum L.), and crop K requirement under Na supply ranging from low to high. Plant growth and seed yield of all three crops were lower at 40mgK/kg than at 100mgK/kg soil. Although 100mgNa/kg (4dS/m in soil solution) had little effect on canola cv. Boomer and wheat cv. Wyalkatchem, the salt-Treated narrow-leafed lupin cv. Mandelup died at 47 days after sowing, regardless of amount of soil K. In low-K soils, canola with 100mgNa/kg and wheat with 50mgNa/kg did not show K-deficiency symptoms and produced greater seed yield than plants with nil Na addition. At 100mgK/kg, Na-induced reduction in growth and yield occurred only to plants with 200mgNa/kg. However, at 160mgK/kg, 200mgNa/kg did not have an adverse effect. In canola and wheat, shoot K concentration increased and shoot Na concentration decreased with increasing amount of soil K; however, high soil K did not reduce shoot Na concentration in narrow-leafed lupin. The study showed that narrow-leafed lupin was very susceptible to salinity, whereas canola and wheat plants were relatively salt-Tolerant. The stimulation of growth and yield in canola and wheat by low-moderate Na in low-K soils suggests partial K substitution by Na, and that adaptation of canola and wheat to salt-Affected soils can be enhanced by high K supply.

Item Type: Journal Article
Murdoch Affiliation(s): School of Veterinary and Life Sciences
Publisher: CSIRO Publishing
Item Control Page Item Control Page