Dear Rufaro, how are you? It is good of you to check in! Your harvest looks delightful! Well done!!!
I hesitate to alarm you, but it is only fair to tell you that there are rumours down here that the amount of water in Mozambique is so high the secondary rivers are flowing back into the Cahora Bassa Dam. They are going to have to open the sluices of the dam sooner or later, it is only a matter of time. And choosing whether a slow inundation is better than another flood.
I have no way of checking if the rumour is true, nor do I know where you are in relation to the dam, but wanted to warn you in case you need to do anything to prepare for flood and to warn your neighbours. At least beware when you cross dry rivers so no lives are lost.
Your thread should be renamed "too much, too little water" :)
With your sandy patch I see nothing that more humus cannot improve. Making it the focus of your compost building efforts should make it the ideal mealie field, especially if it is at the bottom of your slope where you can slow down the flow of water off the field, always with an easily removable midpoint in case of flood. This site has many discussions of the pro's and cons of hugelkultur swales, I have never had the opportunity to try it on my dry land, sunken hugels are the only thing that works for me. Still, I suggest you look into whether it might be a possibility for your land.
Praying for you!