P4—Lancaster Farming, Saturday, January 24,1981 No-till (Continued from Page 03} have been extremely helpful in determining the fate of N applied to no-tillage com These findings indicated that instead of being leached out of the root zone, much of the fertilizer nitrogen was ac tually tied up” in the organic layer which ac cumulates at the soil surface under no-tillage Some data indicates that under no-tillage, regardless of soil texture, it would be beneficial to delay N ap plication until the demand for hi by the com plant begins to increase, perhaps 5 to 6 weeks after planting or when the corn is 12 to 18 inches tall But additional .research needs to be con ducted on this problem Nitrogen is the most costly of the major fertilizer nutrients required for crop production and obviously must be utilized efficienctly Urea, the most con centrated solid N fertilizer available, is rapidlv becoming the most im portant N source in dr\ blended fertilizers Urea, is also an important con stituent of the increasingly popular liquid N solutions The advantages of urea are excellent physical (handling and storage) characteristics blends well with other fertilizer materials, and contains more N per pound of material than am other N source except anhydrous ammonia However urea has one major disadvantage When not soil incorporated there is a relatively high probability that a significant portion of the N mav be lost to the atmosphere through ammonia volatillization In tests conducted over a 4- year period at three Maryland locations am monium nitrate prilled urea granulated urea and 30% UAN solution were compared at four ap plication rates on no-tillage com In 5 out of the 12 tests BALED WOOD SHAVINGS FOR THE FINEST IN ANIMAL BEDDING AND POULTRY LITTER USE NORTHERN WHITE PINE WOOD SHAVINGS • 4 cu. ft. & 5.4 cu. ft. 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Box 141 Akron, NY 14001 716-542-4507 SJ Sollenberger, Mgr. 301-582-4555 Dealer Inquiries Invited Call Your Local Dealer BRANDT FEED A HORSES SUPPLIES Lebanon PA 717 272-6781 BUCKSHIRE FEED & FARMS KRAMER FEED STORES, INC Perkaste PA Kramer PA 215-855 1040 717 374-8148 C F WILLS A SONS Lemoyne PA 717 763 7951 CAPE HORNE CORNER m G HENNINGER MILLS, INC Red Lion PA Berrysburg PA 717 244-6425 717 362 333 C V FEED COOPERATIVE PHILLIPS FEED SERVICE Mecnanicsburg PA Bath PA 717 766-4161 215 837 606 i C V FEED COOPERATIVE PICKERING VALLEY FEED Shippensburg PA & FARM STORE 717 532 2i9 1 Lionvilte PA 215 363-8810 DENVER WOOD PRODUCTS New Holland °A 717 3544174 urea resulted in gram yields significantly lower than those obtained from am monium nitrate Also in another sof the 1 2 tests. 30% UAN was inferior to am monium nitrate, but usually superior to urea When urea was soil in corporated, research has demonstrated that apparent gaseous ammonia losses were not a problem More efficient use of urea on no tillage corn can apparently be obtained by injecting the urea several inches beneath the soil surface with a special applicator Similar benefits have been observed with N solutions when injected beneath the soil surface, or when surface applied in a solid stream as opposed to a more con ventional fine sprav In an effort to reduce ammonia losses from sur face applied urea and UAN solutions, several \ materials were compared either broadcast or injected (5" to 6" deep' at the Poplar Hill Research Farm near Salisbury in 1979 Similer tests were conducted in 1980 The results were not con sistent but nevertheless encouragmg Placing the nitrogen beneath the soil surface significantly imoroveo com grain yields in 1979 and 1980 In other tests it has frequently Been obsen eo that dribbling \ solutions oetween the rows resulted in higner yields than if the LAN solution had been broadcast in a uniform sprav Another important aspect of fertilizing no-tillage com is the development of excess acidity near the soil surface This can be a serious problem since under the no tillage concept all ot the N fertilizer is applied to the soil surface Soil samples taken from near the surface usualK have a much lower pH than those taken from the entire plow lax er Therefore it is e'ctremeh important that soil samples be taken from the pi oper depth m no-tillage HECKENLUBER TURKEY FARMS Biglerviile PA 717-677-8751 JOHN HERR A SONS Grantville PA 717-469-0888 fields to reflect this surface soil aciditv Weed control in no-tillage corn has often been poor Research at Penn State showed that often the im portant tnazine herbicides such as atrazme and simazme, were de-acti\ated by low soil pH It was soon found that although pH levels of soil samples taken from the entire plow layer appeared to be satisfactory for com. the pH at the soil surface was often much lower, due apparently to the surface application of acid fer tilizers. particularly nitrogen Soil samples taken from set eral depths indicated there was no significant difference in soil pH between the 0 to 1 and the 0 to 2 inch soil samples However. there was often a significant pH difference between the ai erage of the two samples taken near the surface and the sample taken from the 0 to 8 inch depth The latter plow ia\er sample e\en though it senera’l> demonstrated a ’ower soil pH as the nitrogen rate was increased aid adequately measure surface soil dK To comoensate mr this problem Bandel recom menaea two sou samples be taKen from no-tiilace fields one from the 0 to 2 inch denth fo* - dH and lime recommendations ana another sample from me 0 to 8 inch depth for nnospnoms ana potassium soil test anc recommendations The plow depth sample should not be used to estimate lime needs no-tillage fields A no-tillage field that should be tested by the two soil sample method is defined as any held that has not been moldboard plowed for at least one vear and nas recen ed lime and/or fer tilizer Broadcast on tne surface during that period Fields chisel plowed ana/or disked during this period should also be treated as no tiilase for soil sampling since neither of these operations significantly POTTSTOWK ROLLER MILLS Pottstown PA 215 323 8620 SOMERSET FARMER SUPPLY Somerset PA 814-443 2841 UMBERGER MILLS Fontana PA 717-867 5151 UMSERGER MILLS Richland PA 717-856 2324 VAN MAR FEEDS Shoemakersville PA 215 926 2121 WINDY KNOLLS FARM New London PA 215 255 4378 WEST CHESTER FEEDS iVest Chester FA 21 o b9>& 1 Zoo incorporates surface applied no-tillage corn no-tillage has a higher yiel fertilizers —N application rates may potential than convention; 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