Loading...
Please wait, while we are loading the content...
Similar Documents
Optimum fertilization effect on maize yield, nutrient uptake, and utilization in northern China.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Ji-Yun, Jin Ping, He Shu-Tian, Li Jing-Hua, Zhu Ming-Yue, Li |
| Copyright Year | 2009 |
| Abstract | In the last 50 years, maize yields in northern China have improved rapidly. From 1961 to 1988, maize mean yield increased from 1,180 kg/ha to 5,000 kg/ha with a mean annual growth rate of 5.3% (Zhen et al., 2006). This rapid increase in productivity has been mainly dependent on chemical fertilizer application, especially N. However, lack of sciencebased fertilization has prevented farmers from obtaining their attainable yields and profits. Cases of over use or unbalanced fertilization have resulted in low nutrient use efficiency and increased risk of environmental harm. The area presently planted to maize in the northern regions now represents about 20 million (M) ha or about 70% of China’s total maize area. Rational nutrient management is needed to increase the sustainability of maize-based crop production systems in northern China and enhance the environmental protection of the surrounding areas. This study included field experiments in the northeast (Heilongjiang, Jilin, and Liaoning), northcentral (Hebei, Henan, and Shanxi), and northwest (Xinjiang; Zhenyuan, Gansu; and Wuwei, Gansu) regions of China in 2006 to explore and compare yield responses, nutrient uptake, and nutrient utilization. All sites used the same maize cultivar (Zhengdan 958), but the northeast and northwest sites conducted spring maize trials (April to October) while the northcentral sites grew during the summer maize season (June to October). Prior to each sowing, soil samples (0 to 20 cm) were collected and analyzed (Table 1) following National Laboratory of Soil Testing and Fertilizer Recommendations as described by Portch and Hunter (2002). This procedure generated a soil test-based balanced “optimum” nutrient application (OPT) that was compared against farmer practice (FP), and a series of nutrient omission treatments including: OPT-N, OPT-P, and OPT-K. Table 2 shows the OPT and FP rates used at each experiment site. Each experiment was designed in a randomized complete block with three replications. Urea, single superphosphate, and potassium chloride were used as sources for N, P, and K, respectively. Plots received all the P and K, plus half of the N fertilizer as a basal broadcast application, while the remaining N was topdressed at V6 stage. Optimum Fertilization Effect on Maize Yield, Nutrient Uptake, and Utilization in Northern China |
| Starting Page | 18 |
| Ending Page | 20 |
| Page Count | 3 |
| File Format | PDF HTM / HTML |
| Volume Number | 93 |
| Alternate Webpage(s) | http://www.ipni.net/publication/bettercrops.nsf/0/A9D2B39BD720661785257980006FC877/$FILE/Better%20Crops%202009-2%20p18.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
