GreenStart's mission is to foster a resilient energy and food system for New Hampshire by providing technical education and practical agricultural examples. An educational non-profit organization established in 2006, GreenStart sees food and fuel security as the end-product of a vibrant, sustainable agriculture system in New Hampshire.
New Hampshire has 40% of its land area in agricultural soils, yet farms only 10% and imports 95% of its food and fuel. New Hampshire has no significant petroleum resources. To feed and fuel itself from sustainable natural resources, New Hampshire must improve its soils while also improving production.
To achieve this end, GreenStart facilitates projects that
1) increase soil carbon “banking”
2) decrease energy inputs
3) increase both food and fuel outputs (positive energy and carbon balance)
4) promote “tight” cycling of nutrients
5) provide opensource access to appropriate knowledge, seeds and equipment
I agree that a common "trunk" for farm practice record keeping is needed - that can have "branches" for all the various type of analysis that a farm might want to do along the way. As you mention it doesn't make sense to enter the same data in several systems throughout the year.
Other spreadsheet products might be considered too - Open office and google docs spreadsheets for example. Google docs/drive has a mobile interface that would make editing in the field fairly easy. There are now lots of mobile spreadsheets and mobile excel, - the question I suppose is integration.
I think that integration of enterprise analysis tools with the field planning and records keeping will become inevitable at some level - and in the future may be facilitated by farm hack tools like http://farmhack.net/shop/apitronics to auto populate fields or http://farmhack.net/tools/ifarm-imaging-agricultural-research-and-manage... or provide an up to date visual reference to spreadsheet data without even getting into georeferenced images and GIS etc.
Here is a list of the related tools listed so far on Farm Hack
http://farmhack.net/tools/enterprise-budgets-lists-downloads
http://farmhack.net/tools/open-enterprise-budget-organic-eggs
http://farmhack.net/tools/oilseed-oil-meal-and-biodiesel-cost-calculator
http://farmhack.net/tools/crop-planning-software
Gocrop.com out of UVM is also coming along for nutrient management analysis. It has a mobile interface and may become open source as it evolves.