ISSN:
1432-2137
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mathematics
Notes:
Zea mays L.) often gives slower early plant growth, lower yields, and reduced profitability in the northern Corn Belt. The objective of this field experiment was to determine if N source/placement method and row cleaner and starter fertilizer use on high-phosphorus testing soils would enhance no-till production of continuous corn (CC) and corn after soybean [Glycine max (L.) Merr.] (CSb). Experiments were conducted for each cropping system on a tile-drained Nicollet–Webster clay loam complex (fine-loamy, mixed, superactive, mesic Aquic Hapludoll and fine loamy, mixed, superactive, mesic Typic Endoaquoll, respectively) from 1996 to 1998. A 23 factorial design included combinations of with or without row cleaners, 0.0 or 93.5 L ha−1 (0 or 10 gal acre−1) of 10–15–0 starter fertilizer, and N sources anhydrous ammonia (AA) or spoke-injected urea-ammonium nitrate (UAN). A preplant broadcast application of UAN plus N-(n-butyl)thiophosphoric triamide (NBPT) also was compared with spoke-injected UAN. Averaged across 3 yr, surface residue coverage during the growing season remained 〉60% for CC and 〉40% for CSb for all treatments, but was about 8% lower with knife application of AA compared with spoke-injecting UAN. Grain yields were not affected by N source. Yield response to starter fertilizer depended on N source and row cleaners. Continuous corn responded to starter fertilizer (0.5 Mg ha−1 or 7 bu acre−1) when AA was used, but not when UAN was used. Yields of CSb were increased 0.5 Mg ha−1 (8 bu acre−1) by starter fertilizer when row cleaners were not used, but by only 0.2 Mg ha−1 (3 bu acre−1) when row cleaners were used. Injecting UAN increased CC and CSb yields 0.7 Mg ha−1 (10 bu acre−1) and 0.4 Mg ha−1 (6 bu acre−1), respectively, compared with preplant broadcasting of UAN plus NBPT. The data suggest that no-till corn yields on fine-textured, high P testing soils can be enhanced most consistently by using starter fertilizer and by injecting N below the soil surface.
Type of Medium:
Electronic Resource
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