FERTILISATION GUIDELINES FOR THE TABLE GRAPE INDUSTRY

soil 5%)

CHAPTER 5

6,9 24,1 21,7

24,1

25

21,7

20

15

10

6,9

Botrytis rot (%)

3,8

5

3,2

1,7

0 kg N/ha 60 kg N/ha 120 kg N/ha

60 kg N/ha 120 kg N/ha 180 kg N/ha

0

Sandy soil (C = 0.43%)

Loamy soil (C = 1.15%)

FIGURE 5: Die effect of soil texture, carbon content (C) of soil and N fertilisation on the occurrence of post-harvest Botrytis rot of Barlinka grapes in the Hex River valley (Redrawn from Conradie, 2001).

FERTILISATION GUIDELINES FOR THE TABLE GRAPE INDUSTRY | 45