Abstract
Pots experiment was carried out at Mosul University in 2005 summer growing season to investigate the influence of time , level of cutting and their interaction on growth of purple nut grass . CRD design with three replicates was used as a factorial experiment Data were collected after 118 days of sowing tubers . The significant result showed that sprouts of tubers had markedly depressed at week interval but it was increased size and weight of new tubers and dormant tubers number also increased when the cutting be delay three weeks interval . Plants with out cutting ( control treatment) had more number with large size and weight if it compared with the different period of canopy cutting . Plants were cut at soil surface level was more effect and reducing up to 64 , 83.3 and 68.5% for number , weight and size of tubers while plants had cut 3 cm above the soil level was reducing up to 25.3 , 59.2 and 32 % respectively . Nut grass had completely control at one week interval if it compared with plants cut at three weeks interval with 3 cm level above the soil . There was positive correlation between number of dormant tubers and its weight or size . Also positive correlation had seen between size and weight of new tubers . Meanwhile , the correlation was negative between number of leaves and number , weight or size of new tubers .
