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Peaches 



Although Dowpou has a label for use under bearing peach trees, it should be 

 used with care because peach trees are easily injured with this material. 



- — William J. Lord 

 I I I I I I I I I I I I I I I I 



PO MQLOGICAL PARAGRAPH 



Pollin a tion 



A question was asked recently on how long the apple stigmas are receptive 

 to pollination. The stigma is the flower part on which the pollen must land for 

 pollination to occur. If the stigmas have turned brown, they are no longer re- 

 ceptive. In other words, bees in the orchard are of no value if the stigmas 

 have turned brovm prior to bee activity. 



Research workers have found tliat apple stigmas are apparently receptive as 

 soon as the flower petals unfold, or shortly thereafter, although weather con- 

 ditions are somewhat influential. The length of time that the apple stijjma is 

 receptive also depends upon the weather. Most sources of information indicate 

 the stigma may be receptive from two to five days. The stigma may be receptive 

 longer during cool than warm seasons. 



William J. Lord 



I I I I I I I I I I I I I I I I 



THE RE LATION OF CR OP SIZE TO I JU TRIENT CONTENT OF APPLE FOLIAGE 



In our fertility studies with apples the past ten years, we have found that 

 crop size can have considerable effect on the quantity of several elements in 

 apple foliage. Trees which have received the same fertilizer treatment for 

 several years will have a nitrogen level which is .2 to .3 of a per cent lower in 

 a light crop year than it is in a heavy crop year. The foliage in a light crop 

 year will have a pale green or light colored cast in contrast to the dark green 

 of a heavy crop year. Calcium content follows the same trend as nitrogen and has 

 about the same difference in foliage content between light and heavy crop years. 

 Crop size has a small effect on magnesium. Magnesium is slightly higher in a 

 heavy crop year than in a light crop year. 



Crop size has as much effect on potassium as nitrogen, but the relationship 

 is negative. Leaf potassium is higher in a light crop year and lower in a heavy 

 crop year. Differences of as much as .4 per cent in leaf potassium can occur be- 

 tween heavy and light crop years. There is also a negative relationship between 

 crop size and phosphorus, but the difference between a heavy crop year and a 



