Is boron nutrition is important for groundnut ?
The boron deficiency symptoms are smaller leaves with irregularly shaped margins, stubby roots with dark areas at the internodes, cracked stem, delayed flowering, and production of less number of pegs and single kernel pods. Sufficiency, deficiency and toxic limits of boron are very narrow. Hence, one should be careful about boron application. If any above symptoms are noticed confirm about boron deficiency from the soil test results. Depending on the severity of deficiency, 3 to 5 kg of borax per ha may be applied before sowing along with the other fertilizers. For immediate recovery of plants, foliar spray of 0.1% borax may be practiced.