Introduction

INTRODUCTION
Plants grow best within certain ranges of the various
abiotic factors that make up their environment.
Such factors include temperature, soil moisture,
soil nutrients, light, air and soil pollutants, air humidity,
soil structure, and pH. Although these factors affect
all plants growing in nature, their importance is considerably
greater for cultivated plants, which are often
grown in areas that are at the margins and beyond their
normal habitat and, therefore, that barely meet the
requirements for normal growth. Moreover, cultivated
plants are frequently grown or kept in completely artificial
environments (greenhouses, homes, warehouses)
or are subjected to a number of cultural practices (fertilization,
irrigation, spraying with pesticides) that may
affect their growth considerably.

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