In west Texas,cotton has become an important crop in the last several decades.However,in this hot,dry part of the country there is little rainfall,so farmers irrigate their cotton fields.They must also regularly fertilize the cotton fields because the soil is very sandy.The figure below shows the record of annual productivity (measured in kilograms of cotton per hectare of land)since 1960 in a west Texas cotton field.Use these data to answer the following questions.

-You are conducting an experiment on plant growth.You take a plant fresh from the soil that weighs 5 kg.Then you dry the plant overnight and determine the dry weight to be 1 kg.Of this dry weight,how much would you expect to be made up of organic molecules?

Question

In west Texas,cotton has become an important crop in the last several decades.However,in this hot,dry part of the country there is little rainfall,so farmers irrigate their cotton fields.They must also regularly fertilize the cotton fields because the soil is very sandy.The figure below shows the record of annual productivity (measured in kilograms of cotton per hectare of land)since 1960 in a west Texas cotton field.Use these data to answer the following questions.

-You are conducting an experiment on plant growth.You take a plant fresh from the soil that weighs 5 kg.Then you dry the plant overnight and determine the dry weight to be 1 kg.Of this dry weight,how much would you expect to be made up of organic molecules?