Yield response and nitrogen utilization efficiency by drip-irrigated potato

被引:42
作者
Mohammad, MJ [1 ]
Zuraiqi, S [1 ]
Quasmeh, W [1 ]
Papadopoulos, I [1 ]
机构
[1] Jordan Univ Sci & Technol, Fac Agr, Irbid, Jordan
关键词
fertigation; trickle-irrigation; N utilization efficiency; calcareous soil; potato;
D O I
10.1023/A:1009855426670
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
Two field experiments were conducted in the Jordan Valley to evaluate potato response to N fertigation. Nitrogen as ammonium sulphate was supplied through irrigation water (fertigation) at rates of 0, 35, 70 and 105 mg N l(-1). Soil N application treatment equivalent to the fertigation treatment of 70 mg N l(-1) was included. N-15 labelled ammonium sulphate was used to evaluate the N recovery and utilization efficiency. Yield increased by the N rate. The soil N application gave higher yield than the zero N and lower than the fertigated treatments. The increase in yield was due to the increase in the size of the tubers. The specific gravity was the highest with the zero N. The index ratios of potato tubers were similar with all treatments. The N derived from fertilizers by both tubers and shoots, increased with the N rate regardless of the method of application. The soil application treatments had fertilizer utilization as high as the fertigation treatments and produced total tuber yield not significantly different from that obtained by the fertigation treatment with similar rate. This might be attributed to the poor fertilizer distribution in the root zone in the fine textured soil. The low value of the fertilizer utilization of the plant receiving the (1)5N in the preceding season suggested possibilities of rapid transformation and immobilization by the soil microorganisms.
引用
收藏
页码:243 / 249
页数:7
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