Effects of Irrigation with Treated Wastewater on Root and Fruit Mineral Elements of Chemlali Olive Cultivar

Table 2

Roots N, P, and K contents in the three treatments: rainfed (RF), well water (WW), and treated wastewater (TWW) in “on” and “off” year.

Parameter	Year	Off (2003)			On (2004)
		RF	WW	TWW	RF	WW	TWW
N (% d.m.)	Winter	1.26^aC	1.28^aC	1.27^aC	1.10^bC	1.00^bC	1.26^aC	**
	Spring	1.85^bA	1.90^bA	2.05^aA	1.25^cB	1.39^bB	1.54^aB	***
	Summer	0.84^cD	0.91^bD	0.98^aD	0.75^cD	0.85^bD	0.90^aD	**
	Autumn	1.35^cB	1.40^bB	1.58^aB	1.40^cA	1.50^bA	1.65^aA	**
P (% d.m.)	Winter	0.05^bA	0.07^bA	0.11^aA	0.06^bA	0.07^bA	0.13^aA	**
	Spring	0.05^aA	0.07^aA	0.06^aB	0.04^bB	0.06^aB	0.07^aB	**
	Summer	0.03^aB	0.04^aB	0.04^aC	0.05^bB	0.06^bB	0.08^aB	**
	Autumn	0.05^bA	0.07^aA	0.07^aB	0.05^bB	0.05^bB	0.08^aB	**
K (% d.m.)	Winter	0.20^cD	0.50^aB	0.25^bC	0.07^bC	0.38^aD	0.10^bC	**
	Spring	0.50^cA	1.30^aA	0.95^bA	0.43^bA	0.90^aA	0.80^aA	***
	Summer	0.35^cB	0.52^aB	0.45^bB	0.07^bC	0.50^aB	0.50^aB	**
	Autumn	0.28^cC	0.40^bC	0.47^aB	0.15^cB	0.45^bC	0.55^aB	**

Small letters indicate significant differences (𝑃≤0.05) among treatments within each season and for each year according to LSD test. Capital letters indicate significant differences (𝑃≤0.05) among seasons within each treatment and for each year according to LSD test. Asterisk indicates significant differences between years (mean values of RF, WW, and TWW): significant at 𝑃≤0.01 (**) and 𝑃≤0.001 (***) according to LSD test.