Spatial variation in ‘Hayward’ kiwifruit dry matter content within a growing region across seasons

Figures & data

Figure 1  A, Geographic location of the Te Puke kiwifruit growing region within New Zealand; B, location of model orchards (○) and test orchards (▴) within the Te Puke growing region.

Table 1  Summary statistics of Hayward kiwifruit orchard fruit dry matter content within the Te Puke growing region across consecutive seasons (2003–08). Measures of variation are between-orchard for each individual season and between-season for the 2003–08 figure.

Season	Average	Standard deviation	Coefficient of variation
2003	16.26	0.47	2.89%
2004	16.25	0.48	2.95%
2005	15.99	0.45	2.84%
2006	16.63	0.52	3.15%
2007	17.13	0.53	3.07%
2008	17.08	0.52	3.02%
2003–08	16.56	0.47	3.93%

Figure 2  Modelled spatial variation between ‘Hayward’ kiwifruit orchards average fruit DM content at commercial harvest within the Te Puke growing region over consecutive growing seasons (2003–08).

Figure 3  Geographic location of ‘Hayward’ kiwifruit orchard DM groupings across the Te Puke growing region as identified by k-means clustering. Clusters 1 and 2 contained 57 and 231 of the 288 model orchards, respectively. The fruit DM and altitudes of the orchards located within each geographic cluster are summarized in Table 2 and 3, respectively.

Table 2  Comparison of average DM between orchards located within geographic clusters. Clusters 1 and 2 contained 57 and 231 of the 288 model orchards, respectively.

Season	Cluster 1	Cluster 2	Statistically significant?
2003	16.01	16.33	P<0.01
2004	15.93	16.33	P<0.01
2005	15.69	16.07	P<0.01
2006	16.41	16.68	P<0.01
2007	16.92	17.18	P<0.01
2008	16.80	17.15	P<0.01
2003–08	16.30	16.62	P<0.01

Table 3  Average altitude of model orchards located within geographic clusters.

Geographic cluster		Altitude (masl)
Cluster 1:	North-east zone	15
	South-west zone	193
Cluster 2		103

Table 4  Correlations between modelled spatial predictions and actual test orchard average fruit DM at commercial harvest within and between seasons (2003–08).

Season	Pearson correlation	R ^2
2003	0.403(*)	0.16
2004	0.458(**)	0.21
2005	0.133	0.02
2006	0.404(**)	0.16
2007	0.384(**)	0.15
2008	0.327(*)	0.11
2003–08	0.347(**)	0.12
*Correlation is significant at the 0.05 level (2-tailed)
**Correlation is significant at the 0.01 level (2-tailed).