A Comparison of Annual Versus Average Optima for Fertilizer Experiments

Doll, John P.

doi:10.2307/1238705

Cited by 8 publications

(6 citation statements)

References 6 publications

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“…Expected net returns as a function of N fertilizer rates are shown in Fig. 2 As has been often noted in other studies (Doll, 1972; Sawyer et al, 2006), the expected net return response function was relatively flat in the range of the economic optimum N rates. As a result, a wide range of N rates produce expected net returns near the economic optimum.…”

Section: Resultssupporting

confidence: 70%

Economics of Irrigated Continuous Corn under Conventional‐Till and No‐Till in Northern Colorado

2008

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Conversion of irrigated cropland from conventional tillage (CT) to no‐till (NT) could have several environmental benefits including reduced erosion potential, reduction of greenhouse gas emissions, and conservation of water. However NT must be economically viable if it is to be adopted. Costs of production and economic returns were evaluated for an irrigated, continuous corn (Zea mays L.) system under CT and NT over 6 yr on a clay loam soil in northern Colorado. Yield responses to N fertilization were included to determine economic optimum fertilization rates under each tillage system. Corn grain yields at economic optimum N fertilizer rates were 1.1 to 1.4 Mg ha−1 lower for NT than for CT. However, net returns were $46 to 74 ha−1 higher for NT than for CT due to reductions in operating costs of $57 to 114 ha−1 and reductions in machinery ownership costs of $87 to 90 ha−1. Operating cost savings were realized largely due to fuel and labor reductions of 75% and 71 to 72%, respectively, and in spite of higher N fertilizer requirements of 16 to 55 kg ha−1 for NT compared to CT. No‐till, irrigated, continuous corn appears to be an economically viable option for replacing CT production systems in the central Great Plains, especially when combined with the environmental benefits of the NT system.

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Section: Resultssupporting

confidence: 70%

Economics of Irrigated Continuous Corn under Conventional‐Till and No‐Till in Northern Colorado

2008

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“…Estimating a joint frequency distribution function for these four variables was impractical, so the sample was classified into three ranges each for N s and pH, and four ranges each for P, and K s , yielding 144 soil classes. The frequency distribution of the 1,541 soils over these 144 classes provided the f (Z) function required for equation (5).…”

Section: Short-run Increases In Producers' Incomementioning

confidence: 99%

“…4 Again using equation (5), the average annual income available by moving from zero usage to levels currently recommended [R(O, xt)] is calculated to be $663 per hectare," By implication, then, the average new income which is made possible by the generalized production function analysis is $200 per hectare ($863-663) per year.…”

Section: Short-run Increases In Producers' Incomementioning

confidence: 99%

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Fertilizer Response Information and Income Gains: The Case of Potatoes in Peru

Ryan¹,

Perrin

1974

American J Agri Economics

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“…Several studies have closely examined changes In produc tivity, relating these changes to education and extension (Huffman 1974(Huffman , 1978Rahm and Huffman, 1984;Jamison and Hook» 1984;PudasainI, 1983;Welch, 1970;Lockheed, Jamison 'See Johnson and Gustafson, 1963;Heady and Auer, 1966;Guise, 1969;PerrIn and Heady, 1975;Byerlee and Helsey, 1988;Cardwell, 1982;Fehr, 1984;SMvey, 1981;Schroder, Headley, andFInley, 1984. andLau, 1980). The potential value of more precise crop management Information has also been considered within the context of a single practice (Anderson, 1968(Anderson, , 1975Anderson and Dillon, 1968;Doll, 1971Doll, , 1972Orynan, 1977;Perrin, 1976; Ryan and Perrin, 1974;Havllcek and Seagraves, 1962;Byerlee and Anderson, 1969). And finally, the literature that applies the Parrel1-Schmldt type of efficiency frontier measures to agricultural production Is Implicitly concerned with the relationship between crop management and produc tivity (All and Fllnn, 1989;Hussain, 1989).…”

Section: Statement Of Problemmentioning

confidence: 99%

Agronomic research and productivity growth in post green revolution agriculture

Traxler

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2.1. Consumers' surplus 21 2.2. Producers' surplus 2.3. Effect of supply shift on Imports 25 3.1. Distribution of years of schooling 52 3.2. Distribution of extension contacts per month 52 3.3. Three year moving average wheat yields 54 3.4. Experiment station yields 1967-1988 56 3.5. Three year moving average ratio of farm to experiment station yields 59 4.1. National agricultural research bJdget 69 4.2. ClANO real expenditures 83 4.3. ClANO total expenditures per scientist and per experiment 84 4.4. Wheat research shares of total ClANO expenditures 86 4.5. Wheat share of total agricultural product and of agricultural research expenditures 88 4.6. Research expenditures as percent of production value 89 5.1. Relationship between average recommended and average applied nitrogen levels, 1981 and 1989 107 5B.1. Payoff to different phosphorus use strategies 136 58.2. Value of soil test information under different test accuracy assumptions 137 50.3. I so-expected revenue curves 139 vil Figure Page 6.1 Effect of change In planting method on weed density 6.2 Relationship between yield and weed control expenditures 6.3. Actuàl and projected aggregate adoption of planting In beds 167 7.1. Benefit and cost streams under base model assumptions 176 7.2. Net benefit streams under alternative extension assumptions 178 7.3. Net benefit streams under alternative IPM assumptions 180 7.4. Net benefit streams under alternative surco diffusion assumptions 182 7.5. Net benefit streams under alternative surco cost savings assumptions 184 7.6. Net benefit streams assuming maintenance research costs 185 viii LIST OF TABLES Tab Ie Page 3.1. Percentage of area by variety-Yaqul Valley 63 3.2. Land holdings by type of land tenure 65 4/1. CIANO scientists by discipline and crop 72a 4.2. Number of technical reports In selected research program areas: all crops 77 4.3. Number of technical reports in selected research programs: wheat only 78 4.4. Wheat CMR as share of total experiments in se 1ected program areas and wheat CMR experiments as share of total experiments conducted 79 4.5. CIANO total expenditures 1977-1988 81a 4.6. CIANO wheat research expenditures 1977-1988 82a 5.1. Summary of changes in recommendations 96 5.2. Indicators for tests of changes In management practices 101 5.3. Proportion of producers performing subsolling in clay soils by survey year 105 5.4. Nitrogen use (kg/ha): descriptive statistics and statistical test results 106 5.5. Planting date (days after Nov. 1): descriptive statistics and statistical test results 109 5.6. Average phosphorus dose (kg/ha): full sample average among those that applied phosphorus 111 Echeverria, R. G.

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A Comparison of Annual Versus Average Optima for Fertilizer Experiments

Cited by 8 publications

References 6 publications

Economics of Irrigated Continuous Corn under Conventional‐Till and No‐Till in Northern Colorado

Economics of Irrigated Continuous Corn under Conventional‐Till and No‐Till in Northern Colorado

Fertilizer Response Information and Income Gains: The Case of Potatoes in Peru

Agronomic research and productivity growth in post green revolution agriculture

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