This paper summarizes a series of field experiments that investigated the effects of organic and inorganic nutrients on sweet potato tuber yield in the humid lowlands of Papua New Guinea. In the first experiment, plots were planted with Piper aduncum, Gliricidia sepium and Imperata cylindrica, which were slashed after one year, whereafter sweet potato was planted. Sweet potato yield was lowest ...

in order to study of yield and qualitative characteristics of potato (aola variety), an experiment was conducted in mashhad conditions under irrigation regims and different levels of potassium fertilizer. this experiment was based on randomized copmpletely block with split plot design with three replications in khorasan razavi agricultural and natural resource research center in 2010. three lev...

ABSTRACT The marketable value of potato tubers is affected by damage caused Diabrotica speciosa, whose larvae create holes on the tubers’ skin and internal feeding tunnels. estimation tuber usually performed assessing external to detriment tunnels larvae. Thus, we propose a method estimate D. speciosa larvae, considering aspects separately. For that, plants cv. Agata were grown under different ...

In the article are presented investigation results, which shows effectiveness of urea with urease inhibitor – nBPT in potato growing agroecosystems. The advantages new fertilizer yield increase, and quality improvement. Urea lead to formation bigger tuber size what is one most important characteristic for marketable potato. Fertilizer was tested experimental fields real farm conditions.

Potato grown for early or off-season production plays a crucial role in the economy of several areas in the Mediterranean countries. Irrigation is important for determining yield and earliness, thus a better investigation of plant response under various pedo-climatic conditions can help to improve resource use efficiency and farmer income. A two-year field research (2009-2010) was carried o...