Nuttall, W.F.

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Yield response of barley to nitrogen as affected by soil tests for ammonium- and nitrate-nitrogen

University of Saskatchewan Research Archive

104 Yield Response of Barley to Nitrogen as Affected by Soil Tests for Ammonium- and N~trate-Nitrogen by W. F. Nuttall, Melfort Research Station Yield response 6f Conquest barley_to nitrogen fertilizer applied at 22, 45, 67 and 134 kg/ha with and without 20 kg P/ha were sign~ficantLy related by reg~ession an.lyses to ammonium- and to nitrate-nitrogen in soils of northeastern Saskatchewan. Both linear and quadratic equations obtained from the regression analyses were used to develop tables estimating yield response of ~arley related to nitrogen fertilizer rates and soil tests for ammonium-and nitrate-nitrogen. The results indicated that a greater response to nitrogen fertilizer occurred with a given amount of ammonium plus nitrate-nitrogen than with the same amotint of nitrate-nitrogen alone. Phosphate fertilizer also significantly increased yield respons~ to nitrogen fertilizers. Confidence intervals snowed that wide variation could be ex-1 pected in yield response to nitrogen fertilizers. Variation is attributed to differences in soil type, soil moisture and climatic factors among experimental sites. 105 Table l Analysis of Variance Table Sh,owing Sigrtificant Among-Site and Within~Sit6 v•riation of Barley-Yield Response to N Fertilizer So~rce of variation Among-site Regression+ on nitrate and ammonium-N Residual Within-site Nitrogen, ~· Phosphorus N X p Residual df 4 19 3 l 3 161 Sum of Squares 42,547,744 15,168,).31 lO,p28,136 3,275,161 333,212 19,708,681 ** Significant at 1% probability level. m s 10,636,936 798,323 3,509,379 3,275,161 111.070 122,414 F 13.32** 28.67** 26.75** + Partitioning of variation due to regression into single degrees of freedom is shown in Table 3. 1 The phosphorus effect is a measure of the increased yield response with nitrogen wh~n ph,osphate fertilizer is applied. Variation Nitrate-N-(Nitrate-N)2 N03 + X NH4 -Ammoni Uip--N Residual * Significant ** Significant 106 Table 2 Analysis of Variance Table ShOwing how Soil Test~ for Nitrogen Account for Among-S~te Variation in Barley Response to N df Sums of Squares M S l 26,855,480 26,855,480 l 9,950,224 9,950,224 l 1,224,824 1,224,824 l 4,517,216 4,(517,216 19 15,168,136 798,323 at 5% probability level. at 1% probability level. -F 33.64** 12,46** l. 53 5.66* 46.5 63.8 65.9 73.2 Table 3 Yield Response Estimates of Conquest Barley and 90% Confidence Intervals Obtained from Ragression Equations Relating to Soil Tests for Ammonium- and Nitrate-Nitrogen Fertilizer Ammonium- and nitrate-nitrogen* (p,g N/4g soil) Rate N p 10 20 30 40 50 kg/ha yield increase in kg/ha 1-' 0 22 0 745 ± 400 516 ± 354 361 ± 352 278 ± 361 -...] 45 0 1483 ± 757 973 ± 669 646 ± 665 500 ± 682 67 0 1863 ± 865 1234 ± 765 779 ± 760 500 ± 780 397 ± 884 134 0 2506 ± 1313 1621 ± 1161 lOll ± 1154 677 ± 1184 619 ± 1270 22 20 990 ± 462 632 ± 409 413 ± 406 334 ± 417 45 20 1810 ± 708 1200 ± 626 791 ± 622 584 ± 638 578 ± ,685 67 20 2340 ± 818 1512 ± 724 949 ± 719 651 ± 738 619 ± 792 134 20 3268 ± 1183 2142 ± 1047 1383 ± 1040 992 ± 1067 967 ± 1145 * Equivalent amounts of ammonium- and nitrate-nitrogen. Multiply by 2 = 1b/ac. Fertilizer _ r.a te N p kg/ha 22 0 45 0 67 0 134 0 22 20 45 20 67 20 134 20 * Multiply by ** Multiply by Table 4 Estimates of Yield Response of Conquest Barley and 90% Confidence Intervals Obtained from Regression Equations Relating to Soil Tasts for Nitrate-Nitrogen Nitrate-nitrogen {~g N/4g soil)* 10 20 30 40 yield increase in kg/ha** 499 ± 360 222 ± 352 22 ± 361 932 ± 700 483 ± ~'684 133 ± 703 1204 ± 761 537 ± 743 51 ± 764 1567 ± 1169 696 ± 1143 53 ± 1174 562 ± 454 434 ± 448 306 ± 450 178 ± 1166 ± 687 718 ± 671 366 ± 690 lll ± 1470 ± 833 865 ± 814 394 ± 836 55 ± 1989. ± 1156 1090 ± 1129 413 ± 1161 2 = lb/acre. . 9 = lb/acre . 461 50 709 860 50 ± 479 f-' 0 00 

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Yield response of barley to nitrogen as affected by soil tests for ammonium- and nitrate-nitrogen

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