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Fluid Journal : Fluid Journal 1999-2001
1 Fluid Journal Fall 2001 educed tillage systems have been proven to be effective in maintaining crop residues, reducing soil erosion losses, and conserving water. The amount of surface residue maintained with reduced or no-till systems is critical as it can lower the seed zone temperature, causing problems with nutrient availability and uptake. Success with conservation tillage systems depends in part on fertilizer management. Tillage influences the physical properties of soil and these can change the soil nutrient status and ability of crops to access nutrients. Poor seedling growth resulting from low nutrient availability in cool soils can occur irrespective of residual fertility levels. Starter fertilizer can be applied to place nutrients within the rooting zone of young plants for better availability. Many producers prefer to surface-apply fertilizer either before or at planting by Drs. W. B. Gordon and D. A. Whitney R TTTTTw o By T woByT woByT woByT wo By Two Star wo Star wo Star wo Star wo Starter Superior In Grain ter Superior In Grain ter Superior In Grain ter Superior In Grain ter Superior In Grain Sorghum T Sorghum T Sorghum T Sorghum T Sorghum Trials rials rials rials rials Surface dribble applications greatly improved yields over no-starter check but were not as effective as two by two placement in Kansas minimum-/no-till experiments. Summary: In both no-till and mini- mum-till grain sorghum yields were maximized by application of 2 x 2 starter fertilizer containing either 30 or 45 lbs/A of N with 30 lbs/A of P2O5 Starters containing 30 lbs/A of N and 30 lbs/A of P2O5 decreased the number of days from emergence to mid-bloom by nine days compared to the no-starter check. Although surface face dribble applications greatly improved yields over the no-starter check, they were not quite as effective as the subsurface 2 x 2 starter placement. Results of this research should make conservation tillage a more attractive option to producers. because of the cost and weight of specialized equipment needed to subsur- face band fertilizer at planting, and the potential plugging problems that may arise when fertilizer is knife-applied in heavy residue. Some producers are aware of the benefit of starter fertilizer in strictly no- till systems but are hesitant to use starter systems that include some tillage because they feel the response may not be great enough to justify the expense. The objective of this research has been to investigate the effects of N-P starter combinations applied either subsurface or dribbled at different rates on the soil surface in two tillage systems. Because the 2000 growing 120 115 110 105 100 95 90 85 80 CHECK Figure 2. No-till, starter placement, and composition effects on grain sorghum yield at Belleville, Gordon, et al. , 1999-2000. N/P O RATE - LBS/A 25 YIELD - bu/A DRIBBLE 2x2 0-30 30-0 15-30 30-30 45-30 120 115 110 105 100 95 90 85 80 CHECK Figure 1. Minimum-till, starter placement, and composition effects on grain sorghum yield at Belleville, Gordon, et al. , 1999-2000. N/P O RATE - LBS/A 25 YIELD - bu/A DRIBBLE 2x2 0-30 30-0 15-30 30-30 45-30
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