| Yield effect and optimized-measure combination of N fertilizer and plant density for different peanut variety types under single-seed planting |
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| DOI：10.7606/j.issn.1000-7601.2007.01.42 |
| Key Words: peanut different variety types single-seed planting N fertilizer plant density yields optimized-measures combination |
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| Abstract: |
| Mathematic models between yield and N fertilizer and plant density for two peanut variety types were set up by using quadratic saturation D-optimization design under single-seed planting．Results in analysis of the models showed：（1） there were some differences in yield potential and optimized-measures combination between big-pod variety Huayu 22 and smal-l pod variety Luhua 12. The maximum yield of Huayu 22 was 6498．6 kg／hm2 with the optimized-measures combination of 115．8 kg N／hm2＋2．09×105 plants／hm2 while the maximum yield of Luhua 12 was only 5792．9 kg／hm2 with the optimized-measures combination of 101．9 kg N／hm2 ＋2．22×105 plants／hm2．（2） The big-pod variety Huayu 22 was more sensitive to N rate while the smal-l pod variety was more sensitive to plant density．When the N rate applied was under the optimized amount every kg N could averagely increase 18．2 kg pod for Huayu 22 which is 6.3 kg higher than that for Luhua 12；when the plant number was under the optimized density each increase of10thousand plants could averagely increase 92．3 kg pod for Luhua 12 which is 24．5 kg higher than that for Huayu 22．So to get high yield for smal-l pod variety more attention should be paid to plant density．（3） A measures combination for Huayu 22 was109．0～156．2 kg N／hm2＋1．75～2．57×105 plants／hm2 to get a yield above 5 000 kg／hm2 and for Luhua 12 was 86．6～147．2 kg N／hm2＋1．85～2．58×105 plants／hm2 to get a yield above 4000 kg／hm2. |