"8166","12","archive","17",,,"disk0/00/00/81/66","2014-07-08 05:41:58","2014-07-08 05:41:58","2014-07-08 05:41:58","article",,,"show","Library-ICRISAT@CGIAR.ORG",,,"","","","","","","","","","",,,,"Ssali","H","","","","","","","Ssali","H","","","","",,,,,"","",,,,,"","","SADCC/ICRISAT(Bulawayo)","Zimbabwe","Initial and residual effects of nitrogen fertilizers on grain yield of a maize/bean intercrop grown on a Humic Nitosol and the fate and efficiency of the applied nitrogen                                                                                                                                    ","pub","s2.4","","","restricted",,,"Calcium ammonium nitrate (CAN), urea, urea supergranules (USG), nitrogen balance, 15N studies, nitrogen placement, nitrogen efficiency",,,"Initial and residual effects of nitrogen (N) fertilizers on grain yield of a maize/bean intercrop grown on a deep, well-drained Humic Nitosol (66% clay, 3% organic carbon) were evaluated. Enriched (15N) N fertilizer was used to study the fate of applied N in two seasons: using urea (banded) at 50 kg N ha−1 in one season, and15N-enriched urea (banded), calcium ammonium nitrate (CAN, banded), and urea supergranules (USG, point placement) were applied in the other season (different field) at 100 kg N ha−1. Nitrogen fertilizer significantly (P = 0.05) increased equivalent maize grain yield in each season of application with no significant differences between N sources, i.e., urea, CAN, and USG. Profitmaximizing rates ranged from 75 to 97 kg N ha−1 and value: cost ratios ranged from 3.0 to 4.8. Urea gave the highest value: cost ratio in each season. Most (lowest measurement 81%) of the applied N was accounted for by analyzing the soil (to 150 cm depth) and plant material. Measurements for urea, CAN, and USG were not significantly different. The high N measurements suggest low losses of applied N fertilizer under the conditions of the study. Maize plant recovery ranged from 35 to 55%; most of this N (51–65%) was in the grain. Bean plant recovery ranged from 8 to 20%. About 34–43% of the applied N fertilizer remained in the soil, and most of it (about 70%) was within the top soil layer (0–30 cm). However, there were no significant equivalent maize grain increases in seasons following N application indicating no beneficial residual effect of the applied fertilizers","1990","published",,"Fertilizer Research","23","2","Kluwer Academic Publishers",,"63-72",,,,,,,,,,,"TRUE",,"0167-1731",,,,,,"","http://dx.doi.org/10.1007/BF01063332 ","http://scholar.google.co.in/scholar?as_q=Initial+and+residual+effects+of+nitrogen+fertilizers+on+grain+yield+of+a+maize%2Fbean+intercrop+grown+on+a+Humic+Nitosol+and+the+fate+and+efficiency+of+the+applied+nitrogen++&as_epq=&as_oq=&as_eq=&as_occt=title&as_","pub",,"IFDC","",,,,,,"",,,,,,,"",,,,,"",,,,,"","",,,,,"","",,,,,
"8166",,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,"s2.5",,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,