supported by the National Natural Science Foundation of China(No.31372310);the Youth Fund of Orient Science and Technology College of Hunan Agricultural University(No.14QNZ09);the Cultivation Physiology Station of National Technical System in Rapeseed Industry(No.CARS-13);the National Key Technology R&D Program of China(Nos.2012BAD15B04,2014BAC09B01-01,and 2014BAD14B01)
Background: Nitrogen(N), phosphorous(P), and potassium(K) are critical nutrient elements necessary for crop plant growth and development. However, excessive inputs will lead to inefficient usage and cause exces...