Getachew Agegnehu

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Questions related from Getachew Agegnehu

Is it necessary to undertake an experiment to determine rates or doses for micronutrients?

It is well known that micronutrients are equally important for plant growth and development, but they are required by plants in small quantities. If they are taken in excess amount, especially in...

24 July 2018 478 13 View

Which one is the best approach (fixed plot by creating a gradient or under on-farm condition) to determine critical soil phosphorus concentration?

Soil test calibration study enables researchers to determine the critical soil P concentrations or revise the P fertilizer recommendation for an area based on major soil type, i.e. soil texture...

27 March 2018 1,270 11 View

Can organic agriculture fulfill the growing needs of the people and feed the world?

Providing healthy food for everyone is undoubtedly the most important issue for mankind in the future. Organic agriculture has also been advocated since recent years in relation to environmental...

19 August 2016 2,865 73 View

What is the best and efficient method for determining soil microbial biomass and diversity?

The soil microbial biomass acts as the transformation agent of the organic matter in soil. The biomass is both a source and sink of the nutrients C, N, P and S held in the organic matter. It is...

03 August 2016 7,917 18 View

Does the N conversion factor for the estimation of the protein content of a seed or grain vary based on analytical methods and crop types?

According to some literature (e.g. Bender 2005) , ‘Crude protein’ is defined as N × 6.25 (Kjeldahl determination). Others mentioned like for wheat and most cereals it is 5.8; rice, 5.95; soya,...

21 May 2015 1,835 16 View

Which form of N is most readily available for plant uptake? Is NO3-N or NH4-N? Is there preferential difference in crops for these nutrients?

Both NO3-N and NH4-N are the forms of N that are taken by plants. Several literatures show that NO3-N is the most available form of N. I appreciate if anyone can comment on this and whether there...

25 April 2015 7,075 33 View

Is that possible to derive the amount of biologically fixed N by legumes if the nodule dry weigt per plant is known?

Root nodule symbiosis helps nitrogen‐fixing bacteria convert atmospheric N into a form that is directly available for plant growth. But I couldn’t find a research finding which indicates whether...

25 April 2015 7,528 2 View

Is there a factor to change a SPAD chlorophyll content reading directly into micro gram per area?

The SPAD 502 Chlorophyll Meter can measure the chlorophyll content of leaves, and thereby enables to estimate indirectly the nitrogen status of plants. It is very efficient and non-destructive...

22 March 2014 8,227 9 View