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Table 5 The influence of fertiliser on needle nutrient concentration at age 10 years across all five sites of the first trial series established in 1971

From: The importance of harvest residue and fertiliser on productivity of Pinus patula across various sites in their first, second and third rotations, at Usutu Swaziland

Nutrient in needles (%)

First rotation (F1R)

Second rotation (F2R)

No fertiliser

Fertiliser

Statistical significance of F-test

No fertiliser

Fertiliser

Statistical significance of F-test

Nitrogen

1.87

1.81

n.s.

1.65

1.75

n.s.

Phosphorus

0.129

0.143

**

0.126

0.142

*

Potassium

0.60

0.69

***

0.52

0.59

**

Calcium

0.21

0.22

n.s.

0.21

0.20

n.s.

Magnesium

0.17

0.16

n.s.

0.18

0.15

**

  1. n.s. not significantly different
  2. * = 5% level, ** = 1% level, *** = 0.1% level (adapted from Morris: Trial series B43: Site preparation and fertilizer application at time of planting, part 1: Influence on volume increment (Unpublished))