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Boron and Manganese Effects on Cotton Yield, Lint Quality, and Earliness of Harvest¹

Manganese (2.23 and 4.46 kg/ha) and boron (0.45 and 0.89 kg/ha) were applied as a sidedressing to cotton on 13 different soils in Georgia. Both total yield and the percent of that yield obtained at first harvest were increased without detrimental effect on lint strength, length, or fineness, despite the fact that no deficiency symptoms of Mn or B were observed on the check plots. Yield increases were negatively correlated with the water soluble soil Mn and B, and positively correlated with pH. With few exceptions, the Mn and B content of soil and leaf samples from untreated plots were higher than those usually rated as deficient, suggesting that cotton yield and earliness of harvest benefit from relatively high levels of these elements.

Key Words: leaf boron • leaf manganese

² Soil Scientist and Associate Soil Chemist, respectively. Univ. of Georgia Coll. of Agr. Exp. Sta., Georgia Station, Experiment 30212.

Received for publication February 18, 1968.