Wisconsin Integrated Cropping Systems Trial Project
 
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Potentially leachable fall nitrate in the 0 ­ 2 foot soil depth at ARS and LAC (1993 ­ 2000) with contrasts.

Environment: Env1 Env2 Env3 Env4 Env5 Env6 Env7 Env8 Env9 Env10 Env11 Env12 Env 13 Env14* Env 15 Env 16*  
Location: LAC93 AR93 AR94 LAC94 LAC95 AR95 AR96 LAC96 ARS97 LAC97 ARS98 LAC98 ARS99 LAC99 ARS00 LAC00 Avg**
  NO3-N (lb/2 ft-A)
CS1. Corn 115.6   80.9 132.5 105.5   97.0 137.2   73.9 142.7   88.9 115.2 118.7   60.8 67.1 63.3 98.1 80.4 98.6
CS2. Soybean   72.8   85.5   65.5   82.5   90.9 109.1   61.1   56.5 111.0 126.9   75.8   75.6 71.9 57.1 67.9 58.3 79.3
CS2. Corn   50.1   94.3 141.0   66.5 105.3 105.0 159.1   70.7   98.9   78.2   74.2   52.3 61.1 44.8 81.8 73.2 84.8
CS3. Sb/w   77.3   74.5   57.5   56.5   94.7 108.3   64.6   60.2   99.2 102.9   74.9   53.8 53.3 52.0 54.9 63.0 71.7
CS3. Wht   47.0   52.7   39.0   52.0   76.4   66.4   32.2   39.2   68.1   79.3   56.1   67.0 38.3 40.3 48.6 53.8 53.5
CS3. Corn   49.8   71.2   86.0 101.5 100.4 114.2   40.2   62.8 100.2   99.8   88.2   63.9 68.2 58.4 52.9 114.0 79.5
CS4. Alf   66.9   67.3   64.5   85.0   91.2   91.3   51.8 117.5   88.1 110.7   78.5   66.4 56.6 62.6 55.5 48.8 75.2
CS4. Alf1   55.3   45.4   35.5   74.0   96.3   92.6   54.2   67.8   86.7 105.8   86.5   78.2 56.3 48.4 53.2 - 69.1
CS4. Alf2   49.8   58.3   38.5   78.2 100.8   83.1   54.3   67.5 110.9 115.4   70.2   66.8 50.9 49.5 82.0 52.6 70.6
CS4. Corn 106.1 121.7 137.2 182.5 155.9 146.9   85.9 114.7 185.9 171.0   97.0 104.0 121.1 75.7 144.9 106.2 128.5
CS5. O/a   44.4   93.5   54.5   68.0 105.6   76.8   60.4   55.5   75.1 109.2   63.4   66.3 46.4 74.3 53.4 66.6 69.6
CS5. Alf1   69.9   71.4   55.5   68.0 112.8   84.5   45.1   67.5   89.3   79.1   54.6   63.6 47.0 49.9 59.7 57.4 67.2
CS5. Corn   67.7   99.0 126.5 155.0 124.4 156.1   73.2   87.5 143.8 170.4 119.0   85.3 139.6 84.8 100.2 127.4 116.2
CS6. Past.   54.2   79.7   48.7   97.7 100.7   76.2   82.9   93.9   76.0 175.4   72.7   74.1 47.7 52.7 50.9 62.6 77.9
System                                  
CS1 115.6   80.9 132.5 105.5   97.0 137.2   73.9 142.7   88.9 115.2 118.7   60.8 67.1 63.3 98.1 80.4 98.6
CS2   61.4   89.9 103.2   74.5   98.1 107.0 110.1   63.6 105.0 102.6   75.0   64.0 66.5 51.0 74.9 67.8 82.2
CS3   58.0   66.1   60.8   70.0   90.5   96.3   45.7   54.1   89.2   94.0   73.1   61.6 53.3 50.2 52.1 76.9 68.2
CS4   69.5   73.2   68.9 104.9 111.0 103.5   61.5   91.9 117.9 125.7   83.1   78.9 71.2 59.1 83.9 69.2 85.8
CS5   60.7   88.0   78.8   99.6 114.3 108.4   60.9   70.2 102.7 119.6   79.0   71.7 77.7 69.7 71.1 81.9*** 84.6
CS6   54.2   79.7   48.7   97.7 100.7   76.2   82.9   93.9   76.0 175.4   72.7   74.1 47.7 52.7 50.9 62.6 77.9
                                   
  Pr>F
Grain vs. Forage 0.4412 0.5410 0.0002 0.0023 0.0024 0.2125 0.2081 0.0783 0.0355 0.0006 0.8407 0.0008 0.0221 0.0046 0.0542 0.8180 0.0120
CC vs other Corn 0.0002 0.5995 0.0001 0.0327 0.7438 0.0003 0.8538 0.0001 0.5780 0.2689 0.0002 0.8201 0.3537 0.0545 0.0001 0.3346 0.0001
CS2 vs CS3 0.7379 0.0066 0.0001 0.7244 0.3909 0.1675 0.0001 0.3994 0.1144 0.5213 0.8313 0.7019 0.0897 0.8905 0.0012 0.1050 0.0019
Pst vs other Forag 0.3375 0.9848 0.0043 0.7372 0.2599 0.0032 0.0976 0.3926 0.0037 0.0017 0.4196 0.8168 0.0053 0.0921 0.0008 0.0863 0.7377
Hi vs low inp For 0.3027 0.0391 0.0938 0.6487 0.6631 0.7339 0.7774 0.0257 0.0712 0.5806 0.5944 0.1795 0.3149 0.0235 0.0235 0.0305 0.6274
C vs Sb in CS2 0.1564 0.4967 0.0001 0.4201 0.2951 0.7309 0.0001 0.4177 0.4291 0.0223 0.9094 0.0204 0.3624 0.1487 0.1733 0.1598 0.5677
C vs oth in CS3 0.3694 0.4979 0.0002 0.0084 0.2139 0.0126 0.5908 0.3882 0.2144 0.6263 0.0681 0.6752 0.0338 0.0985 0.8954 0.0001 0.0172
Sb vs Wht CS3 0.0611 0.0971 0.0908 0.8199 0.1853 0.0011 0.0715 0.2330 0.0467 0.2559 0.1861 0.1804 0.2087 0.1686 0.5339 0.3858 0.0073
C vs alf in CS4 0.0005 0.0001 0.0001 0.0001 0.0001 0.0001 0.0286 0.0378 0.0001 0.0009 0.1110 0.0001 0.0001 0.0023 0.0001 0.0011 0.0001
DS vs est  CS4 0.2979 0.1721 0.0050 0.6047 0.5353 0.7382 0.8722 0.0020 0.4195 0.9955 0.9902 0.4694 0.7683 - 0.1719 0.7194 0.2224
Alf1 vs alf2 CS4 0.7280 0.3207 0.7801 0.8297 0.7420 0.4271 0.9955 0.9863 0.1181 0.6416 0.2503 0.2442 0.6460 0.9024 0.0067 - 0.9145
C vs other CS5 0.0807 0.4594 0.0003 0.0739 0.2754 0.0005 0.9720 0.1508 0.0001 0.0001 0.0001 0.0195 0.0001 0.0033 0.0001 0.0001 0.0001
O/a vs alf CS5 0.1126 0.0928 0.9258 0.6849 0.5987 0.5431 0.4517 0.4929 0.3541 0.1494 0.5324 0.7809 0.9563 - 0.5372 - 0.7703
CS1 vs rest 0.0002 0.7627 0.0001 0.3041 0.4702 0.0002 0.5566 0.0001 0.2265 0.8927 0.0003 0.1757 0.9004 0.3664 0.0004 0.3998 0.0008
P vs non CC 0.4463 0.8498 0.0018 0.5892 0.7014 0.0041 0.1718 0.0982 0.0137 0.0002 0.5957 0.5917 0.0274 0.3813 0.0089 0.1195 0.5835
Cash vs For (nocc) 0.3364 0.4700 0.3019 0.0006 0.0017 0.4423 0.1410 0.0014 0.0152 0.0043 0.2038 0.0019 0.0030 0.0005 0.0002 0.3632 0.0002
C(cash) vs C(for) 0.7806 0.0164 0.5219 0.0001 0.0002 0.0008 0.0049 0.6503 0.0001 0.0001 0.2494 0.0001 0.0001 0.0001 0.0001 0.0002 .00001
Seeded vs est(alf) 0.7926 0.0112 0.0227 0.5801 0.5791 0.7317 0.6996 0.0992 0.1590 0.4604 0.9546 0.6119 0.9896 - 0.1133 - 0.3319
* Treatment changes occurred this year in CS4 replacing dsa with oat/pea/forage mix and in CS5 replacing oats/alfalfa with soybeans. ** Contrast average from 1993-1999 due to difficulties in data analysis in 2000 with system changes at LAC *** Soybean phase of system was 76.2 lb NO3-N/2 ft-A

 

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