This is a link to a website that has a full (almost) collection of monthly pamphlets produced by the British government to help encourage self sufficiency during the war and afterward. The pamphlets are really interesting and also full of easily digestible tips and help.

This is just a small excerpt:

CROP ROTATION is most important!

Some gardening beginners have no doubt been puzzled by the term “crop rotation.” It sounds a bit mysterious, but it is really quite simple. And it is the only sound basis for vegetable growing. To be a successful gardener you must be methodical.

What does “crop rotation” mean?

Simply arranging your cropping is such a ways to avoid growing the same kinds of crops on any section of your plot one year after another. To grow the same crop on the same ground year after year is bad gardening for several reasons. There is also the risk that diseases and pests will be increased in the soil to attack again the following year. Rotation of vegetable crops affects the condition of your land in four important ways.

> It ensures that every part of your plot carriers, at regular intervals, crops that require thorough soil cultivation.

> It helps to maintain the content of plant food and humus in all parts of the plot. Some crops will repay for heavier dressing of fertilisers than others, and some will get what farmyard manure or compost is available.

> It helps to control weeds, for different crops need different cultivations at different seasons; though weeds may withstand the appropriate cultivations for one crop, they may be kept down by the cultivations for another crop.

> It helps to control pests and diseases.

Visit the complete collection here: Earthly Pursuits - Ministry Guides