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18 results on '"Li, Jiuhao"'

7. Evaluating the Influence of Deficit Irrigation on Fruit Yield and Quality Indices of Tomatoes Grown in Sandy Loam and Silty Loam Soils

Author

Alordzinu, Kelvin Edom, primary, Appiah, Sadick Amoakohene, additional, AL Aasmi, Alaa, additional, Darko, Ransford Opoku, additional, Li, Jiuhao, additional, Lan, Yubin, additional, Adjibolosoo, Daniel, additional, Lian, Chenguo, additional, Wang, Hao, additional, Qiao, Songyang, additional, and Liao, Juan, additional

Published
2022
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8. Real-Time Assessment of Mandarin Crop Water Stress Index

Author

Appiah, Sadick Amoakohene, primary, Li, Jiuhao, additional, Lan, Yubin, additional, Darko, Ransford Opoku, additional, Alordzinu, Kelvin Edom, additional, Al Aasmi, Alaa, additional, Asenso, Evans, additional, Issaka, Fuseini, additional, Afful, Ebenezer Acheampong, additional, Wang, Hao, additional, and Qiao, Songyang, additional

Published
2022
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10. Impacts of Slow-Release Nitrogen Fertilizer Rates on the Morpho-Physiological Traits, Yield, and Nitrogen Use Efficiency of Rice under Different Water Regimes

Author

AL Aasmi, Alaa, primary, Li, Jiuhao, additional, Hamoud, Yousef Alhaj, additional, Lan, Yubin, additional, Alordzinu, Kelvin Edom, additional, Appiah, Sadick Amoakohene, additional, Shaghaleh, Hiba, additional, Sheteiwy, Mohamed, additional, Wang, Hao, additional, Qiao, Songyang, additional, and Yu, Chaoran, additional

Published
2022
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16. Head and lateral length on water distribution uniformity of a PVC drip irrigation system

Author

Asenso Evans, Chen Hai-Bo, Issaka Fuseini, Brako Bismark, LI Jiuhao, and Ofori Emmanuel

Subjects
Pressure head, Drip tape, Materials science, Coefficient of variation, Analytical chemistry, Head (vessel), Distribution uniformity, Drip irrigation, General Agricultural and Biological Sciences, Water resource management, Soil gradation, Discharge rate
Abstract

Characteristics of emitters under low pressure are essential for the design of low pressure drip irrigation systems. Few data is provided by the manufacturers for drip emitter operating under low pressures. No guidelines regarding the optimum combination of operating pressure head and lateral length available either. A laboratory test was conducted to evaluate the effects of pressure head and lateral length on water distribution uniformity of a PVC drip irrigation system. Five different lengths of lateral were considered under a pressure head of 55 kPa (8.21 psi / 5.6 m). The five lengths were 20, 40, 60, 80 and 100 m. Drip tape tested in this study is a non-pressure compensating (NPC) emiiter with 3.00 L/h discharge rate, 16 mm diameter and 35 cm emitter distance. Evaluation of 10 sampled emitters from the 20 m lateral showed a flow variation (Qvar) of 5%, uniformity coefficient (UC) of 99%, with a coefficient of variation (Cv) of 0.016. The 40 m lateral length showed a flow variation (Qvar) of 9%, UC of 98% with a Cv of 0.024. The 60 m lateral length also showed an average flow variation (Qvar) of 16%, UC of 95% with a Cv of 0.060. The 80 m lateral length showed a flow variation (Qvar) of 23%, UC of 93% with Cv of 0.08 and the 100 m lateral length showed a flow variation (Qvar) of 39%, UC of 89% with a Cv of 0.138. EU for 20, 40, 60, 80 and 100 m were 92, 90, 80, 75 and 58% respectively. Flow discharge vs. sampled emitter points (Q-E curves) was also developed for each length. Q-E curves were fitted to the data resulting in R2 values of 0.1566, 0.1202, 0.8607, 0.7904 and 0.8998 respectively for 20, 40, 60, 80 and 100m. The operating pressure was 55 kPa (8.21 psi / 5.6 m) for all the tested length. From the statistical analysis, it was observed that as the lateral length increase invariably decreases the average discharge (Qvar). It is therefore recommended to use the 60 m lateral length with a low pressure head of 55 kPa (8.21 psi / 5.6 m), since the 60 m length satisfied the uniformity distribution criteria under a low pressure. Key words: Pressure head, lateral length, irrigation uniformity.

Published
2014

18. Moldboard Plowing with Direct Seeding Improves Soil Properties and Sustainable Productivity in Ratoon Rice Farmland in Southern China.

Author

Asenso, Evans, Zhang, Luyong, Tang, Lingmao, Issaka, Fuseini, Tian, Kai, Li, Jiuhao, and Hu, Lian

Abstract

Several tillage and planting methods have been proposed to enhance the soil bulk density, biological community, and grain yield of rice. In this work, we present the impact of plowing methods with different rice crop establishment approaches, i.e., moldboard plowing with mechanical transplanting (MPMT), rotary tillage with mechanical transplanting (RTMT), moldboard plowing with direct seeding (MPDS), and rotary tillage with direct seeding (RTDS), on soil bulk density, microbial community, enzymatic activities, and grain yield of ratoon rice (RR). The results showed that MPDS improved soil bulk density in 0–30 cm depth in both years and both harvesting times (1H: 1st harvest and 2H: 2nd harvest). The results also showed that microbial community significantly improved under MPDS compared to the other treatments in both years and in 1H and 2H. Additionally, enzymatic activities showed a positive effect under MPDS in both years and in 1H and 2H. MPDS subsequently improved rice grain yield by 18.05% and 17.27% in 2017 (1H and 2H), and 14.86% and 18.64% in 2018 (1H and 2H), respectively. In conclusion, MPDS appears to be a more suitable approach to obtaining high soil eminence and health, as well as sustainable RR production. [ABSTRACT FROM AUTHOR]

Published
2019
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