div class=trans-pagebutton class=gotoPage data-page=1Page 1button div class=trans-imageimg data-url=documentphyto80n02-131-aps-home-we-thank-d-j-van-schalkwyk-for-statistical-assistancehtmlpage=1 data-page=1 class=trans-thumb lazyload alt=Page 1: Phyto80n02 131 - APS HomeWe thank D J Van Schalkwyk for statistical assistance and Pauline Smith for the preparation of the manuscript Accepted for publication 9 August 1989 loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mM8Uw8AAh0BTZud3BwAAAAASUVORK5CYII= data-src=https:reader034fdocumentsinreader034viewer20220502195f64cf9767c6a41a245152f7html5thumbnails1jpg width=140 height=200 divdivdiv class=trans-pagebutton class=gotoPage data-page=2Page 2button div class=trans-imageimg data-url=documentphyto80n02-131-aps-home-we-thank-d-j-van-schalkwyk-for-statistical-assistancehtmlpage=2 data-page=2 class=trans-thumb lazyload alt=Page 2: Phyto80n02 131 - APS HomeWe thank D J Van Schalkwyk for statistical assistance and Pauline Smith for the preparation of the manuscript Accepted for publication 9 August 1989 loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mM8Uw8AAh0BTZud3BwAAAAASUVORK5CYII= data-src=https:reader034fdocumentsinreader034viewer20220502195f64cf9767c6a41a245152f7html5thumbnails2jpg width=140 height=200 divdivdiv class=trans-pagebutton class=gotoPage data-page=3Page 3button div class=trans-imageimg data-url=documentphyto80n02-131-aps-home-we-thank-d-j-van-schalkwyk-for-statistical-assistancehtmlpage=3 data-page=3 class=trans-thumb lazyload alt=Page 3: Phyto80n02 131 - APS HomeWe thank D J Van Schalkwyk for statistical assistance and Pauline Smith for the preparation of the manuscript Accepted for publication 9 August 1989 loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mM8Uw8AAh0BTZud3BwAAAAASUVORK5CYII=...