Nuttall, W.F.

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Distribution of N fertilizer applied by aircraft

University of Saskatchewan Research Archive

- 144 -DISTRIBUTION OF N FERTILIZER APPLIED BY AIRCRAFT. By. W. F. Nuttall Research Station, Melfort Distribution of N fertilizer on pasture by aircraft was found to be quite variable (Table 1, Figure 1) with a standard deviation of 26 kg N/ha. Table 1. Nitrogen fertilizer rate distribution in three areas of a pasture as flown on by aircraft A R E A S Container 1 2 3t kg N/ha 125.8 64.5 188.3 2 64.0 40.7 85.2 3 32.2 61.8 93.6 4 37.5 121.0 63.7 5 38.6 47.6 28.0 6 77.7 64.5 23.5 7 76.5 54.0 77.2 8 34.2 38.3 97.5 9 77.6 88.3 62.8 10 27.7 51.7 73.8 > Mean 59.2 63.2 79.4 t Overlap of fertilizer application because of marking error 1 2 3 4 5 6 / ' - - - - - - - - 18.3 m ..c .!-) n:l 7 8 0... .!-) .16 km ..c 0) •r-.--9 10 lJ.. Figure 1. Distribution of containers for measuring fertilizer rates and distribution - 145 -Loss in efficiency of N fertilizer can result with this type of distribution pattern (Lutz et al. 1975). If the response to nitrogen is linear, then theoretically average yield would be the same as an even distribution of fertilizer as follows (Figure 2). t::.Y dy t.N dn If the response is not linear, but quadratic (curvilinear) then the above relationship does not hold. If two fertilizer rates were applied, one t.N below the average, N0 and the other t.N above, then the average yield would be less, becoming the average obtained from the two different fertilizer rates. The loss in yield is shown by the quantity a, in Figure 2 (Jensen and Pesek 1962). Further discussion on the efficiency of fertilizer use is given in the paper by Jensen and Pesek 1962. An experiment is to be set out to determine nutrient variation in the soil and yield response patterns as a result of the N P fertilizer distribution. JENSEN, D. and PESEK, J. 1962. Inefficiency of fertilizer use resulting from nonuniform spatial distribution: I Theory. Soil Sci. Soc. Am. Proc. 26: 170-173. LUTZ, J.A.; JONES, G.P.; HAWKINS, G.W. and HUTCHESON, T.G., Jr. 1975. Effects of uneven spreading of fertilizer on crop· yields. Agron. J, 67: 526-529. <( w 0:: b ,. L'.l y2 .,.. , <( I- , ,. L\y; ,. z ::::) "dy 0 _J w ->-llN LlN N-6N 0 N No APPLIED I N +AN 0 UNIT AREA ~- Figure 2. Relative yield increment of t:.Y2 and yield decrement t:.Yl, resulting from different rates of N. a is the 1 ass in yi e 1 d due to the rate difference. t-' ~ 0\ 

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Distribution of N fertilizer applied by aircraft

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