Effects of Manganese Soaking and Gibberellins Spraying on Wheat Photosynthetic Characteristics and Yield

摘要

Manganese is required for wheat growth, as it is directly involved in several aspects of photosynthesis; however, manganese content varies widely in agricultural soil. An experiment was conducted to investigate the effects of varying levels of manganese in wheat, and to quantify the suitable concentration of manganese under which a high yield of wheat could be obtained. The experiment consisted of manganese seed treatments (seed soaking, with four different concentrations and seed dressing) and spraying with gibberellin (four different concentrations) during the flowering stage. During the wheat growth period, chlorophyll content, photosynthetic parameters, and output were determined. Our results revealed that seed treatment with manganese, in combination with spraying gibberellin during the flowering stage significantly enhanced the photosynthetic efficiency and chlorophyll content in wheat, and resulted in an increase of wheat grain yield by 168%. The seed treatment with manganese application only increased yield by 88.75%. Seed treatment can also affect the late growth of wheat, improve the photosynthetic parameters and chlorophyll content, and improve the wheat yield. In calcareous soil in the northwest of China, moderate application of manganese fertilizer or a moderate amount of manganese pollution is beneficial to wheat production. On the basis of the above results, wheat could be used as an alternative crop when some manganese pollution exists in soil.