Fifteen seeds were placed into 30 cm diameter clay pots, each filled with about 4 kg of loam based garden soil. The seeds were sown at 2 to 3 cm depth in each pot and when seedlings growth became (~7 old days), the seedling density was reduced to 12 seedlings /pot. The pots were watered every 48 h with equal amount of water. When the developed plants reached 40 days old,
5 plants were carefully uprooted from the soil of each treatment; samples were collected for the following analyses