作物生産에 있어서 資源利用에 關한 硏究 : 第2報 보리生産에 있어서 資源利用 Ⅱ. Relationship of resources use in barley production = A Study on the Relationships of Resources Use in Crop Production

다국어 초록 (Multilingual Abstract)

The purpose of this study is to examine the relationships of resources use in crop production in Korea. The publication is the second report, the experiment was carried out to derive the production function in barley production by applying nitrogen and compost as the variable, and other inputs as the constant, and then to examine the economic optima in barley fertilization and for barley yield, deriving the short-run barley supply and fertilizer demand function, isoquants and isoclines.
The data is for 1965 production year, barley production in the experiment is one of two-crop system of rice and barley on paddy land, at the experiment farm, Chinju Agicultural College, Korea.
The weather conditions were not good for early growing period, but suitable rainfall in the latter had made a very good harvest.
Ⅱ
1. The production surface equations by the Quadratic and Cobb-Douglass form are derived as shown in equations 3.1 and 3.2 respectively. Then coefficient of interaction of nitrogen and compost in equation 3.1 by the Quadrstic form was positive compared with that rice production function in the first report had negative and the sum of two exponents in equation 3.2 by Cobb-Douglas form was extraordinarily greater than that of rice.
2. The Profit-maximizing rates of input and output are shown in table 8 and 9, respectively, the other hand, figures 2 and 3 have shown the cross demand functions of nitrogen and cross supply functions barley, respectively, when input level of compost was 600 and 1,200kg.
3. If the capital to purchase the fertilizers is limited to 1,000 won per 10 a and prices situation is same as the equation 10.3, in this time, optimum quantities of input combination and output, and marginl efficiency of capital (1-λ) are shown in equation 10.3
4. Figure 4 and 5 have shown the isoquants and isoclines predicted by the Quadratic and Cobb-Douglas form, respectively.
Ⅲ
Barley seems to be more fertilizer consuming crop compared with rice, especially effect of compost is a remarkable one, and price elasticity of nitrogen demand with compost as constant by the Cobb-Douglas form is -1.32 compared with -1.09 of rice, price elasticity of barley is 0.319 compared with 0.091. of rice, accordingly, prices fluctuation would have more effect on barley production than rice. It seems to be indispensably necessary to apply more compost and nitrogen simultaneously for increase of barley yield so that more application of compost would have increased capacity to embrace the nitrogen.