OddajZUPAN d.o.o, dne 2016-09-16 ob 07:11:41
Comparison of nozzles in cultivation Jonagold
Pictures (left and right) show WSP in cultivation Jonagold at working speed 6,4 km/h. Left tree represents WSP with use of ATR yellow nozzle, right picture represents WSP with use of anti-drift nozzle Albuz TVI green. Anti-drift nozzles produce bigger droplets, which can be seen in the picture on the right. Similar as in cultivation Gala (ISSUE nr. 6) also here the deposit is good, but, we can already sense it visually that the deposit with the same nozzles in cultivation Gala was better.
Comparison of deposit quality with analysis of coloured tracer.
Normalized deposit (Jonagold, double axial ventilator, left tree ATR nozzle right tree TVI nozzle). Small letters represent values in different spots of tree with the same working speed, which differ from each other according to the Turkey HSD test (a < 0,05). Capital letters with different fonts represent significantly different values in the same spot of the same tree with 2 different nozzles.
The anti-drift nozzle TVI had the best result in spot 4, good result in spots 2 and 6 (in the middle of the crown). Comparison between ATR and TVI nozzle didn't return significant statistical differences, except in spot 5, where TVI nozzle showed a little better percentage of spray concentration.
The use of anti-drift nozzle TVI also caused equalization of normalized deposits in different spots of tree in cultivation Jonagold. This is an essential effect for functioning of protection agents, because it minimizes the spots where harmful organisms could burst out.
Deposit results with use of water sensitive papers (WSP).
WSP Coverage rate (%) data. (Gala cultivation, double axial ventilators, left tree yellow ATR nozzle, right tree green TVI anti-drift nozzle, lower set of data -bellow, upper set of data above). Small letters represent values in different spots of tree with the same working speed, which differ from each other according to the Turkey HSD test (a < 0,05). Capital letters with different fonts represent significantly different values in the same spot of the same tree with 2 different nozzles.
Statistical data on the upper side of WSP (picture right) show the best deposit in spot 2, all other spots have also a very good deposit. The most important thing is that the deposit of all spots is almost equal. The lower part of WSP also doesn't indicate any difference between different spots (parts of trees), the same applies for the ATR nozzle.
During test in Jonagold cultivation (picture left and right), we could sense differences between deposit of both nozzles only in 2 spots. In spot 1 on lower side of WSP, the ATR nozzle had worse deposit in compare with TVI nozzle. On the other hand, in spot 4, conversely the ATR returned better deposit. In Jonagold cultivation, the TVI nozzle didn’t have so big difference in results in comparison with Gala cultivation.
During our test we also learned that we can achieve similar deposit with anti-drift nozzles as with normal (ATR nozzles). In case of green wall with smaller density the deposit quality is a little lower but on the other hand in case of green wall with higher density the effect is reverse. The TVI nozzles aren’t a good choice when spraying with lower air capacity.
When using anti-drift nozzles with increased speed we have to pay attention to weather conditions, temperature, wind, humidity. With all this factors in mind we can achieve even better results.
When browsing literature about spraying speeds we found this interesting statement: »Speed doesn’t kill, but time is money. « It is very important to find optimal speed which still allows us good results and combine it with right timing for spraying. This is a combination which will give us successful and effective plant protection (Niederholzer 2015).
Do you want to see the summary of all results? Follow us in last issue- issue nr. 8.
Zupan Sprayers team wish you nice and successful weekend.