You are right about covering the alfalfa seed too deeply.  It is not likely to appear.  Your chance of getting a durable stand of alfalfa on such shallow soil over alkali water is not good, but you can hardly determine that without trying.  Sometimes conditions are better than you think; sometimes worse.  The plant itself is the best judge.  On your lower land you could probably get a better stand of rye grass than anything else — sowing at the beginning of the rainy season.  Of course, however, even that will depend upon how much alkali you have to deal with.

Alfalfa on Adobe.

Is adobe land good for alfalfa?  Is it harder to start than in other soils or not?  How much seed is required to sow an acre?  Also state what time alfalfa should be sowed.

Alfalfa will thrive on an adobe soil if the moisture is kept right — especially guarding against too much water at a time.  It is necessary to irrigate more frequently and apply only as much as can be absorbed by the soil before the hot sun comes on the field, for that scalds the plant badly.  It is harder to get a good stand because of the cracking and hardening of the surface.  Sow about 20 pounds to the acre just as soon as the soil comes into good condition — that is, moist and warm.  February and March are usually the best months, according to the season in the interior valleys.

Alfalfa and Soil Depth.

Do you consider soil which is from 4 to 6 feet deep to hardpan of sufficient depth for alfalfa?  Is there hardpan in the region of Lathrop in San Joaquin county, and can it be dissolved by irrigation, or can any good be accomplished by blowing holes at different places to allow the water to pass to lower levels?  Are other crops affected by hardpan being so close to the surface?

You can grow alfalfa successfully on land which is from four to six feet deep if you irrigate rather more frequently and use less amounts of water each time, so that the plant shall be adequately supplied and yet not forced to carry its roots in standing water.  The Eastern alfalfa grower is fortunate when he gets half the depth you mention, although it does seem rather shallow in California.  Shallow lands are distributed over the valley quite widely.  A deepening of the available soil is usually accomplished by dynamiting, especially so if the hardpan is underlaid by permanent strata.  Alfalfa will penetrate some kinds and thicknesses of hardpan when it is kept moist, but not too wet, to encourage root growth.

Winter-growing green crops are less affected by shallow soil because they generally make their growth while the moisture is ample, if the season is good.

Curing Alfalfa with Artificial Heat.

It is current rumor that “out in California they are hauling alfalfa green and curing it by artificial heat,” thus reducing loss through bad weather and producing a superior hay for feeding or milling purposes.