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Fluid Journal : Fluid Journal 1993-1995
1 Fluid Journal Spring 1993 Summary: The most important thing to remember is that proper fertilizer man- agement takes into account total needs of the crop. Good management looks at the big picture and the best practices have proven performance over time. Liquid starters continue to prove their worth under intensive management. Ad- vantages of starters include: 1) advanc- ing maturity by 5 -10 days, 2) produc- ing drier corn at harvest, 3) producing more vigorous plants that can better withstand weed and insect pressure, and 4) producing responses even in high-P and high-K soils. ake no mistake. Conservation tillage is here to stay. We must learn how to make it work. The practice can cut operating costs for producers. It can reduce ero- sion and increase water use efficiency. We all know, however, that success with the practice requires more than just sav- ing fuel, time, land or water. To be successful we must continue to increase yields per acre so that our unit cost can go down. In other words, the fixed costs (interest, taxes, depreciation and even labor, seed and herbicides) will choke us to death if our yield per acre is too low. To survive, high yields are a must. We can accomplish this with conserva- tion tillage, but bold new fertilizing techniques are imperative. Using liquid starter is one of the necessary operations that makes conservation technology work. Inherent problems Farmers often shy away from adopting conservation technology because of problems they confront when switching to minimum tillage. Weed pressure. Residue often inter- feres with herbicide performance. Weeds can cut yields drastically. Stratification. It's well-known that deep-placed nutrients promote deep root systems. Deep roots allow for higher populations and promote higher yields. No plowing means no mixing, so non- mobile nutrients tend to accumulate on the surface, causing shallow root sys- tems, poor water use efficiency and poor fertilizer efficiency. Nutrient tie-up. Excess surface resi- due immobilizes nitrogen, phosphorus, and sulfur, which all reduce nutrient availability to the crop. Positionally unavailable K. Accu- mulation and decay of potash-rich resi- by Dr. Raun Lohry Liquid Star Liquid Star Liquid Star Liquid Star Liquid Starter Mak ter Mak ter Mak ter Mak ter Makes Conser es Conser es Conser es Conser es Conservation-til l vation-til l v a tion-till v ation-till v ation-till W W W W Work ork ork ork ork Research shows liquid starters continue to excel under intensive management due contributes to the accumulation of potassium in the upper two or three inches of soil. As a result, the subsoil is low in potassium. This lack of subsoil potassium contributes to low yields. Cool temperatures. The insulation effect of residue on the surface lowers subsoil temperatures at planting time. Cooler temperatures reduce phosphorus and potassium uptake and slow mineral- ization of organic nitrogen, causing yel- low and deficient plants at a critical time in a corn plant's life. Denitrification. Conservation tillage increases the potential for denitrification loss because of compaction, high mois- ture levels, and higher microbial popula- tions. This loss of nitrogen can cost a bundle by reducing yields. Poor fertilizer efficiency. Fertilizing conservation tillage with conventional methods can result in poor fertilizer effi- ciency because of stratification, cooler M
Fluid Journal 1996-1998