Growth, chlorophyll content, photosynthesis and water relations in Guava (Psidium guajava L.) under salinity and different nitrogen supply

azote calcium nitrate chlorophylle chlorophylls chlorure de sodium clorofilas crecimiento croissance estoma fertilisation fertilizer application growth nitrate de calcium nitrato de calcio nitrogen pakistani photosynthese photosynthesis psidium guajava salinidad salinity salt tolerance sodium chloride stomata stomate tolerancia a la sal transpiration variedades varieties