Of which: + Y: black pepper yield/hectare (Kg)-dependent Variable;+ β0: coefficient reflects the aggregate productivity levels (and due to the available technology decision); + X 1: the amount of nitrogen-N (Nitrogen) (kg) NET; + X 2: the amount of phosphate-P2O5 (Phosphorus) NET (kg); Amount of Potassium fertilizers-x 3: + K2O (Potassium) NET (kg); + X 4: the amount of manure (kg); + X 5: growth Drugs (Council); + X 6: the amount of plant protection drugs (Council); + X 7: the amount of health care (public); + The Amount harvested: X 8 (work); + X 9: black pepper grower experience (years); + X 10: the number of agricultural extension training (times);+ X 11: education level of the household (number of years in school); + D. X 12: about the same Dummy Variable (0: mixed breed, 1: just like Vinh Linh);+ D. X 13: soil type of the Dummy (0: Red Earth Land, 1: Brown Basalt laterite phase); + turn the parameter shows the influence of the elements from x 1 to x 11 and D1. X 12, D2. X 13 ... Xn + e: random error
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