出版社：Dep. of Statistical Sciences "Paolo Fortunati", Università di Bologna
摘要：In this paper the effect of agronomic factors, and that of their interactions, on wheat protein percentage has been studied. The analysis is based on the data collected on the wheat cultivation of Bologna and Modena provinces in the year 1999-2000 and considers the main agronomic variables. Interesting conclusions about interactions of climatic, soil and cultivation aspects have been drawn by employing the method of nonparametric regression known as regression trees. In particular, the importance of manuring has emerged: a right fertilizing plan, with respect both to the dosage time and to the dosage intensity, seems to damp the consequences of heavy rainfalls or bad previous cultivations.
