Advice on fertilizer policy. some complicating factors in the interpretation of graphs of the yield/nitrogen relationship plotted from estate data

Barham, C.B.F.2014-11-182014-11-181962Tea Quarterly33(3)pp.132-133https://dl.nsf.gov.lk/handle/1/12749AgricultureTeaFertilizer applicationNitrogenYield increaseAgricultural extensionPlant nutrientsAdvice on fertilizer policy. some complicating factors in the interpretation of graphs of the yield/nitrogen relationship plotted from estate dataA