3. Results and discussion
3.1. Yield and yield components
Potato tuber yield varied widely under different amounts of water applied through drip irrigation at different levels of nitrogen (Table 2). Full irrigation supply resulted in the highest tuber yield under all N levels and there were significant reductions on total yield when applying less amount of water. The negative response to irrigation deficit was observed clearly when water supply was less than 20% of crop ET, suggesting that the crop is not very sensitive to moderate water deficit. However, the overall average yield was generally more responsive to water deficit than to N levels within the range of these treatments. The reduction in total yield due to the progressive water deficit averaged 7.8% with 20% (W0.8) reduction in irrigation water, while by applying 40% (W0.6) and 60% (W0.4) less amount of water, potato yield decreased by 27.3% and 44.6%, respectively. Similar results were found by Darwish et al. (2003) and Patel and Rajput (2007). The responses to nitrogen were unexpected: potato yields, regardless of irrigation treatment, increased significantly with increase in N supply up to 280 kg N ha−1, then tended to increase slightly as nitrogen levels increased further.
3. Results and discussion
3.1. Yield and yield components
Potato tuber yield varied widely under different amounts of water applied through drip irrigation at different levels of nitrogen (Table 2). Full irrigation supply resulted in the highest tuber yield under all N levels and there were significant reductions on total yield when applying less amount of water. The negative response to irrigation deficit was observed clearly when water supply was less than 20% of crop ET, suggesting that the crop is not very sensitive to moderate water deficit. However, the overall average yield was generally more responsive to water deficit than to N levels within the range of these treatments. The reduction in total yield due to the progressive water deficit averaged 7.8% with 20% (W0.8) reduction in irrigation water, while by applying 40% (W0.6) and 60% (W0.4) less amount of water, potato yield decreased by 27.3% and 44.6%, respectively. Similar results were found by Darwish et al. (2003) and Patel and Rajput (2007). The responses to nitrogen were unexpected: potato yields, regardless of irrigation treatment, increased significantly with increase in N supply up to 280 kg N ha−1, then tended to increase slightly as nitrogen levels increased further.
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3. Results and discussion
3.1. Yield and yield components
Potato tuber yield varied widely under different amounts of water applied through drip irrigation at different levels of nitrogen (Table 2). Full irrigation supply resulted in the highest tuber yield under all N levels and there were significant reductions on total yield when applying less amount of water. The negative response to irrigation deficit was observed clearly when water supply was less than 20% of crop ET, suggesting that the crop is not very sensitive to moderate water deficit. However, the overall average yield was generally more responsive to water deficit than to N levels within the range of these treatments. The reduction in total yield due to the progressive water deficit averaged 7.8% with 20% (W0.8) reduction in irrigation water, while by applying 40% (W0.6) and 60% (W0.4) less amount of water, potato yield decreased by 27.3% and 44.6%, respectively. Similar results were found by Darwish et al. (2003) and Patel and Rajput (2007). The responses to nitrogen were unexpected: potato yields, regardless of irrigation treatment, increased significantly with increase in N supply up to 280 kg N ha−1, then tended to increase slightly as nitrogen levels increased further.
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