Soil, water and the growing plant

This lesson asks you to describe the factors that affect plant growth. The museum does not teach those factors or how they are measured. It offers one record, on how an agricultural author of the Islamic West linked kinds of soil and water to season and crop, and your class must bring the factors and the evidence for them from elsewhere. ¹

Pick one link the card names, between a kind of soil or water and a plant, and say what you would change, what you would keep the same and what you would measure to test it.

Read one warning closely. The author does not merely declare land good or bad. His soil chapter warns that the surface can differ from what lies beneath, and that judgment requires examination and repeated practical experience ². Soft land, for example, is described through open pores admitting air and water; heavy land through changing behaviour in heat and rain ². "Heavy" does not simply mean useless. Colour alone is insufficient too: assessment varies with the subsurface, season, work and the land's history ². The record of the linked soil, water and crop assessment gives the ten land types and the four water sources.

The record gives no preface in which Ibn Bassal says why he wrote. What it shows is where he worked. He worked within established farming traditions, in a Toledo setting that included Ibn Wafid and al-Mamun's garden ³. In Seville, the accounts connect him with a garden for al-Mutamid and a community of agronomists ³. The Filaha Texts Project notes that his book does not cite earlier agronomic writers and reads this as evidence of personal experience's prominence, though failure to name an earlier book does not prove absence of inherited knowledge ⁴.

The two main sources disagree about one date in his life. Their relocation chronology differs: Ozel places the move after Toledo's 1085 fall, whereas the project says before it ^{3 4}. The record keeps the discrepancy rather than assembling a dated itinerary from accounts disagreeing about the same event ^{3 4}.

It is easy to read the ten land types as a modern soil classification, or the four water sources as a table of chemical tests. The record says the contribution is the network of relationships, not invention of farming or the first recognition that soils differ ⁵. It also declines the English synopsis's simplifying description of river water as universally dry and sour: the Arabic describes variation in dryness, moisture, roughness and softness ^{6 7}.

Ask what was read. The direct witness is the Filaha project's Arabic text, revised from Millas Vallicrosa and Muhammad Aziman's Tetuan 1955 edition, not a manuscript image ⁸. The reading covers the contents, two complete chapters and the opening of chapter 10 ⁸. Ozel reports 273 references to Ibn Bassal in Ibn al-Awwam, which is the reference's count, not the museum's own tally, and some quotations are absent from the available abridgement ⁹.

Ibn Bassal warns that judgment requires examination and repeated practical experience ², and the project reads his silence about earlier writers as evidence of personal experience ⁴. Take a position and answer the strongest objection to it: is repeated experience in a garden enough to show that one kind of soil suits one plant, or must a test change one thing at a time, and why?

• Ibn Bassal's soil and water assessment: the four water sources, the ten land types and what the record says they are not.
• Ibn Bassal: his work in Toledo and Seville, and the limits of the biographies.
• Al-Qasd wa-l-bayan: the abridged book in sixteen chapters.
• Seville: the city of the garden connected with him.

Read the museum's record on Ibn Bassal's linked soil, water and crop assessment and list the kinds of water and land it names. Choose two and say how you would compare them in your class's plant-growth inquiry.