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Zhang J.,Shihezi University | Zhang S.,Xinjiang Academy of Agriculture and Reclamation Science | Chen L.,Tianye Group Ltd. of Xinjiang | Wei C.,Shihezi University
Acta Agriculturae Scandinavica Section B: Soil and Plant Science | Year: 2016

Drip irrigation can produce high rice yields with significant water savings; therefore, it extends rapidly in water-scarce northern China. However, drip-irrigated rice seedlings often exhibit Fe chlorosis. The objective of this field experiment was thus to determine the ability of plant growth regulators to alleviate chlorosis in drip-irrigated rice seedlings. The study compared three plant growth regulators (1-naphthylacetic acid, NAA; sodium nitrophenolate, CSN; and diethyl aminoethyl hexanoate, DA-6) applied in two ways (seed-soaking and drip-application). The results showed that CSN increased root oxidation activity by 37% in the seed-soaking treatment and by 45% in the soil-application treatment. Seed soaking with NAA, CSN, and DA-6 increased the active Fe content in leaves by 8.8%, 17.5%, and 11.4%, respectively, compared with untreated seedlings. Iron absorption and SPAD values were both greater in the soil-application plots than in the seed-soaking plots. Among the plant growth regulators, CSN resulted in the highest yield (2.2% greater than untreated rice in the seed-soaking treatment and 12.8% greater than untreated rice in the soil-application treatment). In conclusion, CSN significantly improved root Fe uptake at the seedling stage and reduced chlorosis in drip-irrigated rice. Therefore, CSN drip application can be recommended for alleviating rice chlorosis in practical use. © 2016 Informa UK Limited, trading as Taylor & Francis Group


Bai R.,Shihezi University | Chen L.,Tianye Group Ltd. of Xinjiang | Zhang X.,Shihezi University | Wei G.,Shihezi University | Wei C.,Shihezi University
Archives of Agronomy and Soil Science | Year: 2016

Drip irrigation offers potential for rice (Oryza sativa L.) production in regions where water resources are limited. However, farmers in China’s Xinjiang Province report that drip-irrigated rice seedlings sometimes suffer salt damage. The objective of this study was to learn more about the effects of soil salinity and soil temperature on the growth of drip-irrigated rice seedlings. The study consisted of a two-factor design with two soil salinity treatments (0 and 1.8 g kg−1 NaCl) and three soil temperature treatments (18°C, 28°C and 36°C). The results showed that shoot biomass, root biomass and root vigor were greatest when seedlings were grown with no salt stress (0 g kg−1 NaCl) at 28°C. Moderate salt stress (1.8 g kg−1 NaCl) combined with high temperature (36°C) significantly reduced root and shoot biomass by 39–53%. Moderate salt stress and high temperature also increased root proline concentration by 77%, root malonyldialdehyde concentration by 60% and seedling mortality by 60%. Shoot and root Na+ concentrations, shoot and root Na+ uptake and the Na+ distribution ratio in shoots were all the greatest when moderate salt stress was combined with high temperature. In conclusion, high soil temperature aggravates salt damage to drip-irrigated rice seedlings. Therefore, soil salinity should be considered before adopting drip-irrigation for rice production. © 2016 Informa UK Limited, trading as Taylor & Francis Group


Li L.,Tianye Group Ltd. of Xinjiang | Chen L.,Tianye Group Ltd. of Xinjiang | Zhang T.,Tianye Group Ltd. of Xinjiang | Yin Y.,Tianye Group Ltd. of Xinjiang | And 2 more authors.
Paiguan Jixie Gongcheng Xuebao/Journal of Drainage and Irrigation Machinery Engineering | Year: 2015

In order to explore the change in the growth of rice roots by mulch drip irrigation, japonica type rice “T-04” and “T-43” were adopted to study the form of rice root, roots, activity and nitrate reductase activity in mulch drip irrigation. The results indicate that at the depth of 20 cm, the length, surface area, volume and diameter of roots in mulch drip irrigation are all higher than those in the tradition basin irrigation. There is no significant difference at the depth of 40 cm; the activity of root on rice shows the trend of raising first and depressing later, and the highest stage and the tillering stage of rice are different in different cultivars of rice. The roots' activity in mulch drip irrigation is higher than that in the tradition basin irrigation in the jointing-booting stage, full heading stage and milk-ripe stage. The anti-aging ability of roots is higher than that in mulch drip irrigation. Nitrate reductase (NR) activity in mulch drip irrigation is higher than that in the tradition basin irrigation. There is no significant difference in the tillering stage and milk-ripe stage. There is significant difference in the jointing-booting stage and full heading stage. ©, 2015, Editorial Department of Journal of Drainage and Irrigation Machinery Engineering. All right reserved.

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