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| Effects of Integrated Rootzone Management on Greenhouse Tomato Growth and Nitrogen Utilization |
| LI Jun-liang1，ZHANG Jing-wei1，WANG Li-ying2，3，JIN Sheng-ai1，CHEN Qing2 |
| 1College of Resources and Environment Sciences，Qingdao Agricultural University，Qingdao 266109，Shandong，China|2College of Resources and Environment Sciences，China Agricultural University，Beijing 100193，China|3Agricultural Resources and Environment Institute，Hebei Academy of Agriculture and Forestry Sciences，Shijiazhuang 050051，Heibei，China |
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Abstract The effects of two treatments，including rootzone water and fertilizer management（W2FS）and integrated rootzone management（W2FR）on tomato（Lycopersicon esculentum Mill.）yield，root growth，N utilization and soil Nmin residue were conducted in greenhouse tomato system in Shouguang．The results showed that significant reduction in the amount of water and fertilizer input were found in the W2FS and W2FR treatments compared to conventional treatment，indicating the reduction of irrigation amount by 29% and the reduction of fertilizer amount（N-P2O5-K2O）by 59%，23%，42% and 79%，78%，48%，respectively．Integrated rootzone management（W2FR）significantly improved root growth and development. Compared to W1FC，W2F0，W2FS treatments，the total root length in W2FR treatment increased by 57%，42% and 46%，root surface in W2FR treatment increased by 62%，34% and 36%，and root volume in W2FR treatment increased by 70%，29% and 29%，respectively．The partial productivity of fertilizer（N-P2O5-K2O）increased by 4.0，3.7 and 1.0 folders with integrated rootone management（W2FR），in comparison to conventional management．Intergated rootzone management technology can improve the use efficiency of fertilizer and decrease the risk of nitrogen leaching．
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Received: 03 August 2011
Published: 10 October 2011
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