| Effects of row spacing and seeding rate on grain yield and net income of irrigated spring wheat by spread band drilling |
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| DOI：10.7606/j.issn.1000-7601.2016.06.03 |
| Key Words: spread band drilling row spacing seeding rate spring wheat grain yield net income |
| Author Name | Affiliation | | FAN Sheng-zu | Jingtai County Agro-technical Extension Center of Gansu Province,Jingtai, Gansu 730400, China | | CHEN Cui-xian | Jingtai County Agro-technical Extension Center of Gansu Province,Jingtai, Gansu 730400, China | | LIU Guang-cai | Gansu Province Agro-technical Extension Station, Lanzhou, Gansu 730020, China | | ZHOU Ting-fen | Jingtai County Agro-technical Extension Center of Gansu Province,Jingtai, Gansu 730400, China | | YAO Xue-zhu | Jingtai County Agro-technical Extension Center of Gansu Province,Jingtai, Gansu 730400, China | | TAO Ying | Jingtai County Agro-technical Extension Center of Gansu Province,Jingtai, Gansu 730400, China | | WANG Na | Jingtai County Agro-technical Extension Center of Gansu Province,Jingtai, Gansu 730400, China |
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| Abstract: |
| The objective of this study was to determine the appropriate combining patterns for row spacing and seeding rate under spread band drilling of irrigated spring wheat(Triticum aestivum L.).A 3-yr field experiment was conducted from 2012 to 2014 in Jingtai County (37°11′N,104°03′E) belonged to the Yellow River Irrigation Area of Gansu Province, in which the seed band width of intra-row was 10 cm over 3 years. The designs included row spacing ranged from 18 to 28 cm with 5 levels, and seeding rate ranged from 263 to 600 kg·hm-2 with 4 or 5 levels, by three replications in every trials. Using the method of stepwise regression analysis offered in the IBM SPSS Statistics 19.0, a mathematical model was established for grain yield with row spacing and seeding rate. There was a significant and negative interaction of row spacing and seeding rate on yield, so optimum seeding rate increased as row spacing decreased. At seeding rate of 383 kg·hm-2, grain yield was not affected by varied row spacing, while on lower and higher seeding rate compared to the above, varying row spacing showed a contrary response on yield. Higher yield was obtained when narrower row spacing combining with higher seeding rate, so the combination for maximum yield was 18 cm of row spacing with 526 kg·hm-2 of seeding rate. But the combination for maximum net income was 28 cm of row spacing with 263 kg·hm-2 of seeding rate. However, more than 99% of maximum net income were achieved by two groups of obviously different combination below, (i) 28 cm of row spacing with 263 kg·hm-2 to 309 kg·hm-2 of seeding rate, and(ii) 18 cm of row spacing with 478 kg·hm-2 to 527 kg·hm-2 of seeding rate, and these were recommendations to producer. More importantly, the serious reduction of yield appeared in or nearby the case of the widest row spacing combining with the most seeding rate, followed by the case of the narrowest row spacing combining with the least seeding rate. |
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