20 results on '"Roberts H."'
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2. Seasonal Changes in the Temperature Requirements for Germination of Buried Seeds of Aphanes arvensis L.
3. Seed Persistence in Soil and Seasonal Emergence in Plant Species from Different Habitats
4. Seed Survival and Seasonal Emergence of Seedlings of Some Ruderal Plants
5. Periodicity of Seedling Emergence and Seed Survival in some Umbelliferae
6. Periodicity of Seedling Emergence and Achene Survival in Some Species of Carduus, Cirsium and Onopordum
7. Emergence and Longevity of Seeds of Annual Weeds in Cultivated and Undistrubed Soil
8. Studies on the Weeds of Vegetable Crops: III. Effect of Different Primary Cultivations on the Weed Seeds in the Soil
9. Studies on the Weeds of Vegetable Crops: I. Initial Effects of Cropping on the Weed Seeds in the Soil
10. Studies in the Principles of Phytotoxicity: III. THE pH FACTOR AND THE TOXICITY OF 3 : 5-DINITRO-o-CRESOL, A WEAK ACID
11. Seed survival and periodicity of seedling emergence in four weedy species of Papaver.
12. Field emergence and temperature requirements for germination in Solanum sarrachoides Sendt.
13. Seed production by an arable weed community.
14. Emergence patterns of weed seedlings in relation to cultivation and rainfall.
15. Quantitative relationships between the weed flora after cultivation and the seed population in the soil.
16. Seed dormancy and field emergence in Solatium nigrum L.
17. Seed dormancy and periodicity of seedling emergence in Veronica hederifolia L.
18. CHANGES IN THE NUMBERS OF VIABLE WEED SEEDS IN SOIL UNDER DIFFERENT REGIMES.
19. FATE OF SEEDS OF SOME ANNUAL WEEDS IN DIFFERENT DEPTHS OF CULTIVATED AND UNDISTURBED SOIL.
20. Herbicide Performance and Soil Surface Conditions.
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