Soil fertility refers to the ability of the soil to continuously provide and coordinate requirements for crops such as water, fertilizer, gas, and heat. Soil fertility is the basic property and essential characteristic of soil. The four major fertility factors are commonly referred to as soil moisture, soil nutrients, soil air, and soil heat.
Various fertility factors are interrelated and inseparable. Therefore, soil fertility is a comprehensive manifestation of various fertility factors and is an important factor in determining crop yield. At present, soil fertility cannot be summed up by the exact number. Usually, the yield, ie, the blank yield, of the crops grown on soil without any fertilizer is used as a comprehensive indicator of soil fertility. In general, the high yield of blanks indicates that the soil has a strong fertility and high fertility; on the contrary, it shows that the soil has weak fertility and low fertility.
Various fertility factors are interrelated and inseparable. Therefore, soil fertility is a comprehensive manifestation of various fertility factors and is an important factor in determining crop yield. At present, soil fertility cannot be summed up by the exact number. Usually, the yield, ie, the blank yield, of the crops grown on soil without any fertilizer is used as a comprehensive indicator of soil fertility. In general, the high yield of blanks indicates that the soil has a strong fertility and high fertility; on the contrary, it shows that the soil has weak fertility and low fertility.
This obstetric examination bed is suitable for obstetrics and gynecology for parturition;
also suit for after the birth of observation and implementation of gynecological examination, diagnosis and operation;
The exam table is easy to operation, table up and down by electric control, back plate controlled by gas spring;
Obstetric Examination Table,Gynecology Examination Table,Obstetric Exam Table,Ce Approved Obstetric Examination Table
Shandong Lewin Medical Equipment Co., Ltd. , https://www.operatinglight.nl