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--- library:articles:n_basics 2010/03/22 15:58
+++ library:articles:n_basics 2010/03/22 16:04 current
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-Pre-Plant, Fall: As of this writing, there is no dependable soil test for N at this time of the year. The Illinois Nitrogen test developed by Dr. Richard Mulvaney is showing some progress, but is not yet ready for general use.
+**Pre-Plant, Fall:** As of this writing, there is no dependable soil test for N at this time of the year. The Illinois Nitrogen test developed by Dr. Richard Mulvaney is showing some progress, but is not yet ready for general use.
-Pre-Plant, Spring: As of this writing, there is no dependable soil test for N at this time of the year
+**Pre-Plant, Spring:** As of this writing, there is no dependable soil test for N at this time of the year
-Pre-Sidedress:The Pre-Sidedress Nitrogen Test (PSNT) developed Magdoff (U of VT) and made popular by Penn. State Univ. and Iowa State Univ. is an effective means of determining the amount of N required by a few selected crops. **A soil sample for the PSNT must be taken to a depth of 12" in much of the Corn Belt and EasternStates, and must be taken to a depth of 24" in many areas of the dry Great Plains. There is no calibration for interpreting the PSNT taken at more shallow depths. **
+**Pre-Sidedress: The Pre-Sidedress Nitrogen Test (PSNT)** developed Magdoff (U of VT) and made popular by Penn. State Univ. and Iowa State Univ. is an effective means of determining the amount of N required by a few selected crops. **A soil sample for the PSNT must be taken to a depth of 12" in much of the Corn Belt and Eastern States, and must be taken to a depth of 24" in many areas of the dry Great Plains. There is no calibration for interpreting the PSNT taken at more shallow depths or at a different height of corn other than 12". **
-^ Suggested times for soil sampling for use of in-season soil nitrate tests (PSNT) on various crops ||||
+^  Suggested times for soil sampling for use of in-season soil nitrate tests (PSNT) on various crops  ||||
-^ Crop ^ Scientific name ^ Time of soil sampling  |
+^  Crop  ^  Scientific name  ^  Time of soil sampling  |
-| Beets | Beta vulgaris | After thinning (2- to 4-leaf sages)  |
+| Beets |  Beta vulgaris  |  After thinning (2- to 4-leaf sages)  |
-| Broccoli | Brassica oleracea | 2 weeks after transplanting  |
+| Broccoli |  Brassica oleracea  |  2 weeks after transplanting  |
-| Brussels sprouts | Brassica oleracea | 2 weeks after transplanting  |
+| Brussels sprouts |  Brassica oleracea  |  2 weeks after transplanting  |
-| Cabbage | Brassica oleracea | 2 weeks after transplanting  |
+| Cabbage |  Brassica oleracea  |  2 weeks after transplanting  |
-| Cauliflower | Brassica oleracea | 2 weeks after transplanting  |
+| Cauliflower |  Brassica oleracea  |  2 weeks after transplanting  |
-| Celery | Apium graveolens | 2 weeks after transplanting. Sample again in about 3 to 4 weeks  |
+| Celery |  Apium graveolens  |  2 weeks after transplanting. Sample again in about 3 to 4 weeks  |
-| Corn, field | Zea mays | When plants are 15 to 25 cm (6 to 10 inches) tall  |
+| Corn, field |  Zea mays  |  When plants are 15 to 25 cm (6 to 10 inches) tall  |
-| Corn, sweet | Zea mays | When plants are 15 to 25 cm (6 to 10 inches) tall  |
+| Corn, sweet |  Zea mays  |  When plants are 15 to 25 cm (6 to 10 inches) tall  |
-| Cucumber | Cucumis sativus | When vines are 15 cm (6 inches) long  |
+| Cucumber |  Cucumis sativus  |  When vines are 15 cm (6 inches) long  |
-| Eggplant | Solanum melongena | At first fruit set. Sample again 3 to 4 weeks later  |
+| Eggplant |  Solanum melongena  |  At first fruit set. Sample again 3 to 4 weeks later  |
-| Endive and escarole | Cichorium endivia | 2 weeks after transplanting or after thinning if direct seeded (2-4 leaf stage)  |
+| Endive and escarole |  Cichorium endivia  |  2 weeks after transplanting or after thinning if direct seeded (2-4 leaf stage)  |
-| Irish potato | Solanum tuberosum | When vines are 15 cm (6 inches) long.  |
+| Irish potato |  Solanum tuberosum  |  When vines are 15 cm (6 inches) long.  |
-| Lettuce | Lactuca sativa | 2 weeks after transplanting or after thinning if direct seeded (2-4 leaf stage)  |
+| Lettuce |  Lactuca sativa  |  2 weeks after transplanting or after thinning if direct seeded (2-4 leaf stage)  |
-| Muskmelon | Cucumis melo | When vines are 15 cm (6 inches) long  |
+| Muskmelon |  Cucumis melo  |  When vines are 15 cm (6 inches) long  |
-| Pepper | Capsicum annuum | At first fruit set. Sample again 3 to 4 weeks later  |
+| Pepper |  Capsicum annuum  |  At first fruit set. Sample again 3 to 4 weeks later  |
-| Pumpkin | Cucurbita pepo | When vines are 15 cm (6 inches) long  |
+| Pumpkin |  Cucurbita pepo  |  When vines are 15 cm (6 inches) long  |
-| Rutabaga | Brassica napus | After thinning (2- to 4-leaf sages).  |
+| Rutabaga |  Brassica napus  |  After thinning (2- to 4-leaf sages).  |
-| Spinach | Spinacia oleracea | At 2- to 4-leaf stages. Sample again after cutting  |
+| Spinach |  Spinacia oleracea  |  At 2- to 4-leaf stages. Sample again after cutting  |
-| Tomato | Lycopersicon esculentum | At first fruit set. Sample again 3 to 4 weeks later  |
+| Tomato |  Lycopersicon esculentum  |  At first fruit set. Sample again 3 to 4 weeks later  |
-| Turnip | Brassica rapa | After thinning (2- to 4-leaf sages).  |
+| Turnip |  Brassica rapa  |  After thinning (2- to 4-leaf sages).  |
-| Winter squash | Cucurbita maxima | When vines are 15 cm (6 inches) long  |
+| Winter squash |  Cucurbita maxima  |  When vines are 15 cm (6 inches) long  |
 | Reference: "In-Season Soil Nitrate Testing as a guide to nitrogen Management for Annual Crops, J.R. Heckman, Rutgers Univ., Hort Technology, October-December 2002  ||||