Makokha Phabian, Ssali Reuben T, Rajendran Srinivasulu, Wanjala Bramwel W, Matasyoh Lexa G, Kiplagat Oliver K, McEwan Margaret A, Low Jan W
International Potato Center, Nairobi, Sub-Saharan Africa, Kenya.
International Potato Center, Kumasi, Sub-Saharan Africa, Ghana.
J Crop Improv. 2019 Oct 12;34(1):84-102. doi: 10.1080/15427528.2019.1674758. eCollection 2020.
In Sub-Saharan Africa, sweetpotato pre-basic seed is multiplied in screenhouses using a sterilized soil substrate. This is expensive and unsustainable. The use of sand substrate with a fertigation system ("sandponics"), is an alternative. The study compared the cost-effectiveness for pre-basic seed production using the sandponics system to the conventional soil substrate for four genotypes. A randomized complete block split plot design was used, and data collected on vine traits over six harvests. Real-time cost data were collected for cost-effectiveness analysis. Results showed a highly significant (p < .0001) 21.8% increase in the vine multiplication rate under the sandponics system. The cost of producing one sweetpotato node in sandponics was significantly lower by 0.009 US$. The cost-effectiveness of producing pre-basic seed in sandponics varied among the genotypes. The future use of sandponics is discussed with respect to the availability of soluble inorganic fertilizers, varietal specific response to nutrients, and labor implications.
在撒哈拉以南非洲地区，甘薯基础前种子在温室中使用经过消毒的土壤基质进行繁殖。这既昂贵又不可持续。使用带有施肥灌溉系统的沙子基质（“沙培法”）是一种替代方法。该研究比较了使用沙培法系统生产基础前种子与使用传统土壤基质生产基础前种子对四种基因型的成本效益。采用随机完全区组裂区设计，并在六次收获期间收集了藤蔓性状的数据。收集实时成本数据以进行成本效益分析。结果显示，在沙培法系统下，藤蔓繁殖率显著提高了21.8%（p <.0001）。沙培法中生产一个甘薯节的成本显著降低了0.009美元。沙培法生产基础前种子的成本效益因基因型而异。文中还就可溶性无机肥料的可用性、品种对养分的特定反应以及劳动力影响等方面对沙培法的未来应用进行了讨论。
