Nuttall, W.F.

English

University of Saskatchewan Research Archive

- 121 -YIELD RESPONSE OF NORALTA FLAX TO NITROGEN FERTILIZERS AS AFFECTED BY SOIL TESTS FOR AMMONIUM- AND NITRATE-NITROGEN By W. F. Nuttall Research Station, Melfort The average yield response of Noralta flax to nitrogen and phosphorus fertilizers grown on stubble in northeastern Saskatchewan from 1969 to 1972 is shown in Table 1. Table l. Yield response* of Noralta flax grown on stubble to N p fertilizers 1969-72 at Melfort, Parks ide and Somme (6-site years)** Phosphate Nitrogen Fertilizer Fertilizer P (kg/ha) 0+ 22 45 67 134 Yield in kg/ha 0+ 0 185 335 460 597 20+ 0 231 349 561 601 * Yield less 0-0 check yield ** Mean soil tests were, ammonium-N = 13 ~g N/4g soil; nitrate-N = 19 ~g N/4g soil; sodium bicarbonate soluble P = 11 ~g N/4g soil + 0-0 = 899 kg/ha, 0-20 = 896 kg/ha No significant response to phosphorus fertilizer was found within any of the trials. The check yields for nitrogen with and without phosphate fertilizer were similar, 896 and 899 kg/ha. It would appear that average nitrogen response was greater with applied phosphorus. More site-years ideally would be required to properly account for among-site variation by soil test values. Regression analyses (Table 2) has shown that soil tests for nitrogen and phosphorus have accounted for much of the variation in yield response to nitrogen fertilizers among sites. By adding the tests for ammonium- and nitrate-nitrogen together, 77.9% of the variation in response was accounted for at the 134-20, N-P kg/ha rate as compared to 54.5% shown in Table 2. - 122 -Table 2. Regression coefficients of soil tests used to estimate yield response of Nora1ta flax to nitrogen and phosphorus fertilizer application Estimate kg/ha Fertilizer Rate, kg/ha N p Nitrate-N* f.lg N/4g Intercept Soil NaHC03-P** (Nitrate-N)2 f.lg/g Soil R2 % 6 Yield 22 0 364 -18.4 .359 91.6 45 0 795 -36.3 .475 84.2 67 0 875 -35.0 .519 62.0 134 0 1344 -58.7 .764 64.0 22 20 308 14.0 -.328 -17.7 87.4 45 20 512 -38.3 + .517 +29.6 71.8 67 20 957 -57 .l .979 20.8 85.7 134 20 1288 -62.4 1 .043 54.5 0 0 -575 173.7 -3.85 65.2 * Soil test range for nitrate-nitrogen was 5.8 to 34.9 f.lg N/4g soil ** Soil test range for phosphorus was 5.7 to 17.5 f.lg P/g soil The soil test for phosphorus shows some effect on yield toN P fertilizers although response to P fertilizer was not statistically significant within the trials. Estimated yield response of flaxtoN fertilizer is shown in Table 3. Table 3. Estimated yield response of Noralta flaxtoN fertilizer as affected by soil tests for nitrate-N Fertilizer N kg/ha 22 45 67 134 Nitrate-N f.lg N/4g soil 10 20 30 ---Yield increase in kg/ha ---216 482 577 833 140 261 382 477 135 135 293 273 In Figure 1, an indication of the variability in response is shown. Despite this variation in response, the relationship gives a good guideline for fertilizer recomendations. - 123 -800 X 600 • <( _j IJ... CS'> ~ • <( "" I--_j • ~0 <( 0:: 0 z 0 ~~ 0 ,fg • _j 200 4-~ • w -0 >- 0~0 0 0 <l 0~----~------~------~------~-0 I 0 20 30 40 N03- N (ug/4g soil) Figure 1. Yield response to nitrogen fertilizer versus soil test for nitrogen 

Yield response of Noralta flax to nitrogen fertilizers as affected by soil tests for ammonium- and nitrate-nitrogen

eCommons@USASK

https://harvest.usask.ca/bitstream/10388/11251/1/W.F.%20Nuttall%2c%201976b.pdf

Yield response of Noralta flax to nitrogen fertilizers as affected by soil tests for ammonium- and nitrate-nitrogen

Abstract

Similar works

Full text

Available Versions

University of Saskatchewan Research Archive

eCommons@USASK