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Advances in AGRONOMY Vol.30

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The genetic yield potential of most crop plants is severalfold greater than the average yields actually achieved by farmers. Even the best performing cultivars commonly yield in the field no more than about half the level that under ideal conditions we know they can yield. Obviously in nature yields are constrained and often by factors of direct concern to agronomists. One of the primary respon sibilities of crop and soil scientists is to identify the agronomic constraints on yield and then through research to find ways of removing these constraints.

The contributions in this volume help us understand some of the constraints on crop yields and performance. Two reviews deal with variables related to climate. The effects of low temperatures on plants and the response of agronomic crops to these temperatures is the subject of one review. The nature of the roots in relation to the plants ability to meet its water supply needs is covered in a second review.

Modern sensitivity to chemical hazards is expressed in this volume in keeping with a similar concern in the last few volumes.

Two reviews deal with anions commonly found in soils. One gives a general coverage of the reactions and behavior of anions in different soils. The second focuses on a very important supplier of one of the most significant of these anions from a nutritional viewpoint-the phosphates. Rising costs of sulfur needed to manufacture superphosphates make it essential that rock phosphates be examined critically as sources of direct application for this important element.

The potential of hybrid cotton along with the problems encountered with attempts to realize this potential are covered in this volume. The final review concerns soil survey interpretations, not only for agricultural purposes but for other uses as well.
The authors who prepared these contributions have helped maintain the inter- nationality of Advances in Agronomy. Likewise, the subjects they review are of considerable significance in most parts of the world. We are indebted to them for their efforts.

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Availability

9005

631(058) ADV a

Perpustakaan PPKS Medan Lt. 1 (631)

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Detail Information

Series Title

-

Call Number

631(058) ADV a

Publisher

New York : Academic Press., 1978

Collation

xi, 250 hal.: ill.;23,5 cm

Language

English

ISBN/ISSN

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Classification

631(058)

Content Type

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Media Type

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Carrier Type

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Edition

30

Subject(s)

Pertanian

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